THE PATENTS ACT, 1970 (39 of 1970) 5 & THE PATENTS RULES, 2003 COMPLETE SPECIFICATION (See section 10, rule 13) 10 “BATTERY AND CONNECTION DEVICE” 15 20 SONY CORPORATION, of 1-7-1 Konan, Minato-ku, Tokyo 1080075, Japan 25 The following specification particularly describes the invention and the manner in which it is to be performed SP368019WO00 2 DESCRIPTION BATTERY AND CONNECTION DEVICE TECHNICAL FIELD 5 [0001] The present technology relates to a technical field related to a battery having a charging function and a connection device to which the battery is connected. 10 BACKGROUND ART [0002] In various electronic devices such as a still camera and a video camera which include an imaging device, some electronic devices can operate by using power of a battery. 15 For example, the battery is charged in a state of being mounted in a charger, and is mounted in a battery mounting portion of each of the electronic devices in a state of being charged. The charger or the electronic device functions as a connection device to be connected to the battery. 20 [0003] In the above-described battery, connection terminals including a positive electrode terminal and a negative electrode terminal are provided, electrode terminals of the charger or electrode terminals provided in the battery mounting 25 portion are connected to the connection terminals, and charging with respect to the battery, or supply of power from the battery to the electronic device is performed (for example, refer to Patent Document 1). [0004] 30 A battery described in Patent Document 1 includes a housing having an approximately rectangular parallelepiped SP368019WO00 3 shape, cells which are accommodated in the housing, and connection terminals which are electrically connected to the cells, and the connection terminals are disposed at one end of the housing in a longitudinal direction thereof. 5 CITATION LIST PATENT DOCUMENT [0005] Patent Document 1: Japanese Patent Application Laid-Open No. 10 2015-92511 SUMMARY OF THE INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION [0006] 15 However, the battery is attached to or detached from the charger or the battery mounting portion through manual work. Accordingly, there is a concern that the battery is dropped in mistake when performing attachment and detachment work, when gripping the battery with hands, or the like, or 20 the battery may be brought into contact with another structure when performing the attachment and detachment work or the like. [0007] When the dropping or contact of the battery occurs, there is a possibility that a satisfactory connection state with 25 respect to a connection device may not be secured due to breakage or damage of connection terminals. [0008] Here, an object of the present technology is to overcome the above-described problem and to secure a satisfactory 30 connection state with a connection device by reducing occurrence of breakage or damage of connection terminals. SP368019WO00 4 SOLUTIONS TO PROBLEMS [0009] According to a first aspect of the present technology, 5 there is provided a battery including: a housing of which an outer surface includes a plurality of exterior surfaces in directions different from each other, and in which a disposition recess is formed; a cell that is accommodated on an inner side of the housing; and a connector that includes 10 a connection terminal that is connected to an electrode terminal of a connection device, and is disposed in the disposition recess. A surface that forms the disposition recess of the housing is formed as a recess formed surface, and the recess formed surface exists between the exterior 15 surfaces and the connector. [0010] With this arrangement, at least one end surface of the connector is located on a further inner side in the housing in comparison to the exterior surfaces. 20 [0011] According to a second aspect, in the battery according to the present technology, it is preferable that the disposition recess is opened at least in a connection direction between the connection terminal and the electrode terminal, 25 and the recess formed surface exists between the exterior surfaces and the connector in the connection direction. [0012] With this arrangement, in the connection direction, the connector is located on a further inner side in the housing 30 in comparison to the exterior surfaces. [0013] SP368019WO00 5 According to a third aspect, in the battery according to the present technology, it is preferable that the disposition recess is opened to two directions which are perpendicular to each other, and the recess formed surface 5 exists respectively between the exterior surfaces and the connector in the two directions. [0014] With this arrangement, the connector is located on a further inner side in the housing in comparison to the exterior 10 surfaces in the two direction perpendicular to each other. [0015] According to a fourth aspect, in the battery according to the present technology, it is preferable that a part of the recess formed surface is formed as an inclined surface 15 in which an opening area of the disposition recess increases as the inclined surface is spaced apart from the connector in an opening direction of the disposition recess. [0016] With this arrangement, the recess formed surface 20 functions as a guide surface during insertion of the electrode terminal into the disposition recess. [0017] According to a fifth aspect, in the battery according to the present technology, it is preferable that the recess 25 formed surface includes a pair of wall portions which is located to be spaced apart from each other in a direction that is perpendicular to the connection direction, and the pair of wall portions is formed as inclined surfaces which are spaced apart from each other as the wall portions are spaced apart 30 from the connector in the connection direction. [0018] SP368019WO00 6 With this arrangement, the pair of wall portions functions as guide surfaces during insertion of the electrode terminal into the disposition recess. [0019] 5 According to a sixth aspect, in the battery according to the present technology, it is preferable that the recess formed surface includes an intermediate portion between the pair of wall portions, and the intermediate portion is formed as an inclined surface in which the opening area of the 10 disposition recess increases as the intermediate portion is spaced apart from the connector in the connection direction. [0020] With this arrangement, the intermediate portion functions as a guide surface during insertion of the electrode 15 terminal into the disposition recess. [0021] According to a seventh aspect, in the battery according to the present technology, it is preferable that an inclination angle of the recess formed surface with respect to the and equal20 connection direction is set to be greater than 0 .to or less than 45 [0022] With this arrangement, the inclination angle of the recess formed surface that functions as the guide surface 25 becomes an acute angle. [0023] According to an eighth aspect of the present technology, there is provided a connection device to which a battery is detachably mounted, the battery including a housing of which 30 an outer surface includes a plurality of exterior surfaces in directions different from each other, and in which a SP368019WO00 7 disposition recess is formed, a cell that is accommodated on an inner side of the housing, and a connector that includes a connection terminal that is connected to an electrode terminal of, and is disposed in the disposition recess. In 5 the battery, a surface that forms the disposition recess of the housing is formed as a recess formed surface, and the recess formed surface exists between the exterior surfaces and the connector. [0024] 10 With this arrangement, a battery in which at least one end surface of the connector is located on a further inner side in the housing in comparison to the exterior surfaces is attached or detached. [0025] 15 According to a ninth aspect of the present technology, there is provided a battery including: a housing that includes a front side portion and a rear side portion which are disposed in a longitudinal direction, a right side portion and a left side portion which are disposed between the front side portion 20 and the rear side portion in a width direction that is perpendicular to the longitudinal direction, a top side portion and a bottom side portion which are disposed between the front side portion and the rear side portion, and the right side portion and the left side portion in a height direction that 25 is perpendicular to the longitudinal direction and the width direction; a cell that is accommodated on an inner side of the housing; and connection terminals which are disposed in a terminal disposition groove formed on a front end side of the housing, and include a positive electrode terminal and 30 a negative electrode terminal which are connected to electrode terminals of a connection device. A front end of at least SP368019WO00 8 one of the positive electrode terminal or the negative electrode terminal is located on a further rear side in comparison to a front end of the front side portion. [0026] 5 With this arrangement, the front end of at least one of the positive electrode terminal or the negative electrode terminal is located on a further inner side in the housing in comparison to the front end of the housing. [0027] 10 According to a tenth aspect, in the battery according to the present technology, it is preferable that a recess, in which at least parts of the electrode terminals are disposed in a state in which the positive electrode terminal and the negative electrode terminal are connected to the electrode 15 terminals, and which is continuous to the terminal disposition groove, is formed in the housing, a part of the recess is opened at least in a connection direction between the connection terminals and the electrode terminals, and a recess formed surface, which is a surface that forms the recess, exists 20 between the outer surface of the housing and the terminal disposition groove in the connection direction. [0028] With this arrangement, at least one of the positive electrode terminal or the negative electrode terminal in the 25 connection direction is located on a further inner side in the housing in comparison to the front end of the housing. [0029] According to an eleventh aspect, in the battery according to the present technology, it is preferable that a recess, 30 in which at least parts of the electrode terminals are disposed in a state in which the positive electrode terminal and the SP368019WO00 9 negative electrode terminal are connected to the electrode terminals, and which is continuous to the terminal disposition groove, is formed in the housing, the recess is opened in two directions perpendicular to each other, and a recess formed 5 surface, which is a surface that forms the recess is formed, exists respectively between the outer surface of the housing and the terminal disposition groove in the two directions. [0030] With this arrangement, in the two directions 10 perpendicular to each other, at least one of the positive electrode terminal or the negative electrode terminal is located on a further inner side in the housing in comparison to the front end of the housing. [0031] 15 According to a twelfth aspect, in the battery according to the present technology, it is preferable that a part of the recess formed surface is formed as an inclined surface in which an opening area of the recess increases as the inclined surface is spaced apart from the terminal disposition groove 20 in an opening direction of the recess. [0032] With this arrangement, the recess formed surface functions as a guide surface during insertion of the electrode terminals into the recess. 25 [0033] According to a thirteenth aspect, in the battery according to the present technology, it is preferable that the recess formed surface includes a pair of wall portions which is located to be spaced apart from each other in a direction 30 that is perpendicular to the connection direction, and the pair of wall portions is formed as inclined surfaces which SP368019WO00 10 are spaced apart from each other as the wall portions are spaced apart from the terminal disposition groove in the connection direction. [0034] 5 With this arrangement, the pair of wall portions functions as guide surfaces during insertion of the electrode terminals into the recess. [0035] According to a fourteenth aspect, in the battery 10 according to the present technology, it is preferable that the recess formed surface includes an intermediate portion between the pair of wall portions, and the intermediate portion is formed as an inclined surface in which the opening area of the recess increases as the intermediate portion is spaced 15 apart from the terminal disposition groove in the connection direction. [0036] With this arrangement, the intermediate portion functions as a guide surface during insertion of the electrode 20 terminals into the recess. [0037] According to a fifteenth aspect, in the battery according to the present technology, it is preferable that an inclination angle of the recess formed surface with respect to the and equal25 connection direction is set to be greater than 0 .to or less than 45 [0038] With this arrangement, the inclination angle of the recess formed surface that functions as a guide surface becomes 30 an acute angle. [0039] SP368019WO00 11 According to a sixteenth aspect of the technology, there is provided a connection device to which a battery is detachably mounted, the battery including a housing that includes a front side portion and a rear side portion which are disposed in 5 a longitudinal direction, a right side portion and a left side portion which are disposed between the front side portion and the rear side portion in a width direction that is perpendicular to the longitudinal direction, a top side portion and a bottom side portion which are disposed between the front side portion 10 and the rear side portion, and the right side portion and the left side portion in a height direction that is perpendicular to the longitudinal direction and the width direction, a cell that is accommodated on an inner side of the housing, and a positive electrode terminal and a negative electrode terminal 15 which are disposed in a terminal disposition groove formed on a front end side of the housing, and are connected to electrode terminals. In the battery, a front end of at least one of the positive electrode terminal or the negative electrode terminal is located on a further rear side in comparison to 20 a front end of the front side portion. [0040] With this arrangement, a battery in which a front end of at least one of the positive electrode terminal or the negative electrode terminal is located on a further inner side 25 in the housing in comparison to the front end of the housing is attached and detached. EFFECTS OF THE INVENTION [0041] 30 According to the present technology, since at least one end surface of the connector or the connection terminal is SP368019WO00 12 located on a further inner side in the housing in comparison to the exterior surface, occurrence of breakage or damage of the connection terminal when being dropped or the like is reduced. As a result, it is possible to secure a satisfactory 5 connection state with respect to a connection device. [0042] Note that, the effects described in this specification are illustrative only and are not limited thereto, and another effect may be exhibited. 10 BRIEF DESCRIPTION OF DRAWINGS [0043] Fig. 1 illustrates embodiments of a battery and a connection device of the present technology in combination 15 with Fig. 2 to Fig. 61, and is an exploded perspective view illustrating the battery. Fig. 2 is a perspective view of the battery. Fig. 3 is a bottom view of the battery. Fig. 4 is a front view of the battery. 20 Fig. 5 is a rear view of the battery. Fig. 6 is a side view of the battery. Fig. 7 is an exploded perspective view illustrating an accommodation case and a connector in the battery. Fig. 8 is a perspective view of the battery in which 25 a configuration of a guide groove is different. Fig. 9 is a side view of the battery in which the configuration of the guide groove is different. Fig. 10 is a side view of another battery in which the configuration of the guide groove is different. 30 Fig. 11 is a perspective view of the battery in which the configuration of the guide groove is different. SP368019WO00 13 Fig. 12 is a perspective view of another battery in which the configuration of the guide groove is different. Fig. 13 is a perspective view of still another battery in which the configuration of the guide groove is different. 5 Fig. 14 is a front view of the battery in which a configuration of a disposition recess is different. Fig. 15 is a bottom view of another battery in which the configuration of the disposition recess is different. Fig. 16 is a front view of the other battery in which 10 the configuration of the disposition recess is different. Fig. 17 is a bottom view of still another battery in which the configuration of the disposition recess is different. Fig. 18 is a front view of the still other battery in which the configuration of the disposition recess is different. 15 Fig. 19 is a perspective view of an imaging device. Fig. 20 is a perspective view illustrating a state in which a mounting space is opened in the imaging device. Fig. 21 is a perspective view illustrating an internal structure of the battery mounting portion. 20 Fig. 22 is a bottom view illustrating a state in which the battery is inserted into a mounting space of the battery mounting portion. Fig. 23 is a cross-sectional view illustrating a state in which the battery is mounted in the battery mounting portion. 25 Fig. 24 is a perspective view illustrating a state in which a pressed recess is formed at a rear end of the battery and the battery is pressed to a pressing lever. Fig. 25 is a perspective view of a charger. Fig. 26 is a plan view of the charger. 30 Fig. 27 is a side view of the charger. Fig. 28 is an enlarged perspective view illustrating SP368019WO00 14 a guide engagement portion and the like of the charger. Fig. 29 is a cross-sectional view illustrating a state in which the battery is inserted into a mounting recess of the charger. 5 Fig. 30 is a cross-sectional view illustrating a state in which the battery is mounted on a battery mounting portion of the charger. Fig. 31 is a cross-sectional view illustrating a state in which the battery is mounted on the battery mounting portion 10 of the charger. Fig. 32 is a conceptual diagram illustrating a state in which the battery is guided to a terminal connection portion when being mounted on the charger. Fig. 33 is a conceptual diagram illustrating a state 15 in which the battery is mounted on the charger and the terminal connection portion and the connector are connected to each other. Fig. 34 is a perspective view illustrating an example in which the connector is located on an upward side in comparison 20 to a bottom surface. Fig. 35 is a perspective view illustrating an example in which the connector is located on a rearward side in comparison to a front surface and on an upward side in comparison to the bottom surface. 25 Fig. 36 is a bottom view illustrating an example in which one of wall portions in a recess formed surface is inclined. Fig. 37 is a perspective view illustrating an example in which a pair of wall portions and an intermediate portion in the recess formed surface are inclined. 30 Fig. 38 is a perspective view illustrating another example of the charger in combination with the battery. SP368019WO00 15 Fig. 39 is a perspective view illustrating still another example of the charger in combination with the battery. Fig. 40 is a perspective view illustrating a state in which the battery is held to the charger in the still other 5 example of the charger. Fig. 41 is a perspective view illustrating an example of the battery in which three engagement recesses are formed. Fig. 42 is a side view illustrating an example of the battery in which the engagement recesses are formed to be opened 10 to a guided groove on the most front side. Fig. 43 is a side view illustrating an example of the battery in which the engagement recesses are formed to be opened to a guided groove on the most rear side. Fig. 44 is a perspective view illustrating an example 15 of the battery in which the engagement recesses are formed in a lower end at a rear end. Fig. 45 is an enlarged bottom view illustrating a front end of the battery. Fig. 46 is a conceptual diagram illustrating dimensions 20 of an identification groove and the like. Fig. 47 is a conceptual diagram illustrating an example of another shape of the identification groove. Fig. 48 is a bottom view illustrating the identification groove and the like in a large-capacity type battery. 25 Fig. 49 is a bottom view illustrating the identification groove and the like in a small-capacity type battery. Fig. 50 is a perspective view illustrating a configuration of a battery mounting portion in a small-power camera. 30 Fig. 51 is a perspective view illustrating a configuration of the battery mounting portion in an SP368019WO00 16 intermediate-power camera. Fig. 52 is a perspective view illustrating a configuration of the battery mounting portion in a large-power camera. 5 Fig. 53 is a perspective view illustrating a configuration of a battery mounting portion in a charger. Fig. 54 is a view illustrating identification characteristics of the identification groove. Fig. 55 is an enlarged front view illustrating an example 10 in which a second portion of the identification groove is formed in another shape. Fig. 56 is an enlarged perspective view illustrating an example of the identification groove in which a first portion and the second portion are formed to be continuous in an upper 15 and lower direction. Fig. 57 is a perspective view illustrating another shape of wall portions in the recess formed surface. Fig. 58 is a bottom view illustrating another shape of the wall portions in the recess formed surface. 20 Fig. 59 is a perspective view illustrating an example of the battery in which a positioning groove is formed in a housing. Fig. 60 is a perspective view illustrating an example of the battery in which a terminal disposition groove and the 25 positioning groove are formed in the housing. Fig. 61 is a perspective view illustrating another example of the battery in which the terminal disposition groove and the positioning groove are formed in the housing. 30 MODE FOR CARRYING OUT THE INVENTION [0044] SP368019WO00 17 Hereinafter, modes for carrying out a battery and a connection device of the present technology will be described with reference to the accompanying drawings. [0045] 5 The battery is formed in an approximately rectangular parallelepiped shape, and in the following description, an outer surface is set as a top surface (upper surface), a bottom surface (lower surface), lateral surfaces (right and left lateral surfaces), a front surface, and a rear surface to 10 represent front, rear, upper, lower, right, and left directions. An upper and lower direction of connecting a top surface side (upper surface side) and a bottom surface side (lower surface side) in which the top surface (upper surface) and the bottom surface (lower surface) exist is set as a height direction, 15 a right and left direction of connecting a left lateral surface side and a right lateral surface side in which the left and right lateral surfaces exist is set as a width direction, and a front and rear direction of connecting a front surface side and a rear surface side in which the front surface and the 20 rear surface exist is set as a longitudinal direction. In addition, an upper end side portion including the top surface is set as a top side portion, a lower end side portion including the bottom surface is set as a bottom side portion, right and left end side portions including the lateral surfaces are set 25 as side portions (a left side portion and a right side portion), a front end side portion including the front surface is set as a front side portion, and a rear end side portion including the rear surface is set as a rear side portion. In addition, respective outer surfaces of the top side portion, the bottom 30 side portion, the side portions, the front side portion, and the rear side portion are not limited to flat surface, and SP368019WO00 18 at least a part thereof may be formed in a curved surface. [0046] In addition, in the following description, as an example of the connection device to which the battery is connected, 5 a still camera that is an imaging device is illustrated. In description of the still camera, it is assumed that front, rear, upper, lower, left, and right directions are set from a viewing direction of a photographer during photographing of the still camera. Accordingly, an object side becomes a 10 forward side, and an image plane side becomes a rearward side. [0047] In addition, in the following description, as another example of the connection device to which the battery is connected, a charger is also illustrated. In description of 15 the charger, the front, rear, upper, lower, left, and right directions are set in a state in which the charge is placed on a base such as a desk or a table. An insertion recess into which the battery is inserted is formed in the charger, and in the charger, the front, rear, upper, lower, left, and right 20 directions are set in a state in which a direction in which the battery is inserted is set as a downward side, and a direction in which the battery slides and is mounted is set as a forward side. [0048] 25 Note that, description of the front, rear, upper, lower, left, and right directions is made for convenience, and there is no limitation to the directions when carrying out the present technology. [0049] 30 First, a configuration of a battery 1 will be described SP368019WO00 19 (refer to Fig. 1 to Fig. 7). [0050] The battery 1 has a configuration in which respective necessary units are disposed on an inner side and on an outer 5 side of a housing 2. [0051] The housing 2 is formed in an approximately rectangular parallelepiped shape, and a case cover (upper case) 3 and an accommodation case (lower case) 4 are coupled in an upper and 10 lower direction. The case cover 3 is formed in a box shape that is opened to the downward side (refer to Fig. 1 to Fig. 6). The accommodation case 4 is formed in a box shape that is opened to an upward side. In a state in which the case cover 3 and the accommodation case 4 are coupled in the upper 15 and lower direction to construct the housing 2, an internal space of the housing 2 is formed as an accommodation space. [0052] A separator 5, cells 6 and 6, connection sheet metals 7, 8, and 8, and a circuit substrate 9 are disposed in the 20 accommodation space of the housing 2 (refer to Fig. 1). The separator 5 is attached to the accommodation case 4. The cells 6 and 6 are disposed in a state of being laterally spaced apart from each other by the separator 5. The connection sheet metal 7 is connected to terminals of the cells 6 and 6 on one side, 25 and a lower end thereof is connected to an electrode terminal (not illustrated) that is formed on a lower surface of the circuit substrate 9. The connection sheet metals 8 and 8 are respectively connected to terminals of the cells 6 and 6 on the other side, and lower ends thereof are connected to 30 electrode terminals (not illustrated) that are formed on the lower surface of the circuit substrate 9. The circuit SP368019WO00 20 substrate 9 is attached to the accommodation case 4, and is in a state of being covered with the separator 5 except for a part from the upward side. [0053] 5 In the housing 2, an outer surface 10 includes a top surface 11, a bottom surface 12, lateral surfaces 13 and 13, a front surface 14, and a rear surface 15, a size in a front and rear direction (longitudinal direction) is set to be greater than a size in a right and left direction (width 10 direction), and the size in the right and left direction (width direction)is set to be greater than a size in an upper and lower direction (height direction) (refer to Fig. 1 to Fig. 6). Inclined surfaces 16 and 16 are formed in the housing 2 respectively between the top surface 11 and the lateral 15 surfaces 13 and 13. The inclined surfaces 16 and 16 are displaced downward as they approach the lateral surfaces 13 and 13 from the top surface 11. [0054] All of the top surface 11, the bottom surface 12, the 20 lateral surfaces 13 and 13, the front surface 14, the rear surface 15, and the inclined surfaces 16 and 16 are formed .as exterior surfaces 17, 17, [0055] Notches 2a and 2a are respectively formed on both right 25 and left side portions in a lower end of the housing 2. Each of the notches 2a is opened to a sideward side (a leftward side or a rightward side), a downward side, a forward side, and a rearward side, and includes a stepped surface 18 that extends in a front and rear direction on the downward side, 30 and a groove formed surface 19 that extends in a front and rear direction on the sideward side. An outer edge of the SP368019WO00 21 stepped surface 18 is continuous to a lower edge of the lateral surface 13. An upper edge of the groove formed surface 19 is continuous to an inner edge of the stepped surface 18, and a lower edge thereof is continuous to a side edge of the bottom 5 surface 12. The stepped surface 18 and the groove formed surface 19 are formed continuously over a region ranging from the front surface 14 to the rear surface 15. [0056] The stepped surface 18 and the bottom surface 12 are 10 formed as flat surfaces which are approximately parallel to each other, and an intermediate portion in a front and rear direction except for both front and rear ends of the groove formed surface 19, and the lateral surface 13 are formed as flat surfaces which are approximately parallel to each other. 15 Front ends of the groove formed surfaces 19 and 19 are formed as outwardly convex curved surfaces 19a and 19a which are displaced in a direction of approaching each other as the front ends approach the front surface 14, and rear ends of the groove formed surfaces 19 and 19 are formed as outwardly convex curved 20 surfaces 19b and 19b which are displaced in a direction of approaching each other as the rear ends approach the rear surface 15. It can be said that the housing 2 includes a main body portion 20 that is a portion on an upper side in comparison to a virtual plane including the stepped surfaces 18 and 18, 25 and a bottom portion 21 that is a portion on a lower side in comparison to the virtual plane. Note that, the stepped surfaces 18 and 18 are included in the main body portion 20. [0057] As described above, in the battery 1, both the front 30 and rear ends of the groove formed surfaces 19 and 19 are formed as the curved surfaces 19a, 19a, 19b, and 19b. Accordingly, SP368019WO00 22 stress concentration is less likely to occur, and the front and rear ends are less likely to come into contact with a ground surface or the like just in case of dropping, or the like. As a result, it is possible to realize mitigation of impact, 5 and it is possible to reduce occurrence of breakage. [0058] As described above, in the housing 2, in a state in which the virtual plane including the stepped surfaces 18 and 18 is set as a reference, an upper side portion including the 10 stepped surfaces 18 and 18 is provided as the main body portion 20, and a portion on a lower side in comparison to the main body portion 20 is provided as the bottom portion 21. A lateral width of the bottom portion 21 is set to be smaller than that of the main body portion 20, a distance between the lateral 15 surfaces 13 and 13 in the right and left direction is set to be greater than a distance between the groove formed surfaces 19 and 19, and grooves and the like which have respective functions are formed in the bottom portion 21. [0059] 20 On both right and left sides of the bottom portion 21, first guided grooves 22 and 22, second guided grooves 23 and 23, and third guided grooves 24 and 24 are formed in this order from a front side in a state of being spaced apart from each other. Each of the first guided grooves 22, each of the second 25 guided grooves 23, and each of the third guided grooves 24 are opened to the groove formed surface 19. [0060] The first guided groove 22 is formed at a front end of the bottom portion 21, and is opened to the sideward side and 30 the forward side. The second guided groove 23 extends in the front and rear direction, and is opened to the sideward side. SP368019WO00 23 Note that, the second guided groove 23 may not be formed in the housing 2. In this case, a portion in which the second guided groove 23 is formed is formed at a part of the groove formed surface 19 and a part of the bottom surface 12. The 5 third guided groove 24 extends in a front and rear direction, and is opened to the sideward side. Note that, the third guided groove 24 may have a shape that is also opened to the rearward side (refer to Fig. 8). [0061] 10 On both the right and left sides of the bottom portion 21, insertion grooves 25 and 25, and insertion grooves 26 and 26 are formed in this order from the front side in a state of being spaced apart from each other. The insertion groove 25 and the insertion groove 26 are opened to the groove formed 15 surface 19. The insertion groove 25 is opened to the sideward side, the upward side, and the downward side, and an opening on an upper side communicates with approximately the half of a front side of the second guided groove 23. The insertion groove 26 is opened to the sideward side, the upward side, 20 and the downward side, and an opening on an upper side communicates with approximately the half of a front side of the third guided groove 24. [0062] Portions between lower edges 22b and 22b of the first 25 guided grooves 22 and 22, and the bottom surface 12 in the housing 2 are provided as first engagement claw portions 2p and 2p. Portions between lower edges 23b and 23b of the second guided grooves 23 and 23 and the bottom surface 12 in the housing 2 are provided as second engagement claw portions 2q and 2q. 30 Portions between lower edges 24b and 24b of the third guided grooves 24 and 24 and the bottom surface 12 in the housing SP368019WO00 24 2 are provided as third engagement claw portions 2r and 2r. Each of the first engagement claw portions 2p and each of the second engagement claw portions 2q are positioned on a further front surface 14 side in comparison to the center of the housing 5 2 in the front and rear direction, and each of the third engagement claw portions 2r is positioned on a further rear surface 15 side in comparison to the center of the housing 2 in the front and rear direction, or in a region on the most rear side among regions obtained by dividing the housing 2 10 into three equal parts in the front and rear direction. [0063] Note that, description has been given of an example in which the first guided grooves 22, the second guided grooves 23, and the third guided grooves 24 are formed to be spaced 15 apart from each other in the front and rear direction, but each of the first guided grooves 22, each of the second guided grooves 23, and each of the third guided grooves 24 may be formed as one guide groove 45 (refer to Fig. 9). The guide groove 45 is formed in a region ranging from a front end to 20 a position biased to a rear end in the groove formed surface 19. In addition, the first guided groove 22, the second guided groove 23, and the third guided groove 24 may be formed as one guide groove 46 (refer to Fig. 10). The guide groove 46 is formed over a region ranging from the front end to the rear 25 end in the groove formed surface 19. [0064] In addition, description has been given of an example in which the first guided groove 22, the second guided groove 23, and the third guided groove 24 are formed on both the right 30 and left sides of the housing 2, but at least any one guide groove among the first guided groove 22, the second guided SP368019WO00 25 groove 23, and the third guided groove 24 may be formed on both the right and left sides of the housing 2. [0065] For example, only the first guided groove 22 and the 5 third guided groove 24 may be formed on at least one side of the right and left sides, and only the second guided groove 23 may be formed on the other side of the right and left sides (refer to Fig. 11). In addition, for example, only the first guided groove 22 and the second guided groove 23 may be formed 10 on at least one side of the right and left sides, and only the second guided groove 23 and the third guided groove 24 may be formed on the other side of the right and left sides (refer to Fig. 12). In addition, for example, only the first guided groove 22 and the second guided groove 23 may be formed 15 on one side of the right and left sides, and only the third guided groove 24 may be formed on the other side of the right and left sides (refer to Fig. 13). [0066] Note that, in addition to the above-described examples 20 (refer to Fig. 11 to Fig. 13), the configuration example includes an example in which only one guide groove among the first guided groove 22, the second guided groove 23, and the third guided groove 24 is formed on one side of the right and left sides, and one, two, or three guide grooves among the 25 first guided groove 22, the second guided groove 23, and the third guided groove 24 are formed on the other side of the right and left sides. In addition, the configuration example includes an example in which only arbitrary two guide grooves among the first guided groove 22, the second guided groove 30 23, and the third guided groove 24 are formed on one side of the right and left sides, and two or three guide grooves among SP368019WO00 26 the first guided groove 22, the second guided groove 23, and the third guided groove 24 are formed on the other side of the right and left sides. [0067] 5 A disposition recess 27 is formed in a front end of the bottom portion 21 (refer to Fig. 7). The disposition recess 27 is formed at approximately the central portion in the right and left direction, and is opened to the forward side and the downward side. A disposition hole 28, which communicates with 10 a portion of the disposition recess 27 except for a front end thereof and passes through the housing 2 in the upper and lower direction, is formed in the housing 2. [0068] An upper edge 22a of the first guided groove 22, an upper 15 edge 23a of the second guided groove 23, and an upper edge 24a of the third guided groove 24 are located at a position on a lower side in comparison to the stepped surface 18, and a part of the groove formed surface 19 exists between the first guided groove 22 and the stepped surface 18, between the second 20 guided groove 23 and the stepped surface 18, and between the third guided groove 24 and the stepped surface 18 (refer to Fig. 2 to Fig. 7). Accordingly, a distance from a lower end of the groove formed surface 19 to the upper edge 22a of the first guided groove 22, a distance from the lower end of the 25 groove formed surface 19 to the upper edge 23a of the second guided groove 23, and a distance from the lower end of the groove formed surface 19 to the upper edge 24a of the third guided groove 24 are set to be shorter than a distance from the upper end of the groove formed surface 19 to the lower 30 end thereof. In addition, a vertical distance (groove width) of the first guided groove 22, the second guided groove 23, SP368019WO00 27 and the third guided groove 24 may be longer or shorter than a distance from the upper end of the groove formed surface 19 to the upper edges 22a, 23a, and 24a, and the vertical distance of the first guided groove 22, the second guided groove 23, 5 and the third guided groove 24 may be the same as the distance from the upper end of the groove formed surface 19 to the upper edges 22a, 23a, and 24a. [0069] Note that, corner portions 2f at which the stepped 10 surface 18 and the lateral surface 13 intersect each other may be chamfered, or the corner portions 2f may extend in a direction from the front surface 14 to the rear surface 15, or may be set to a length that is the same as the length of the housing 2, or a length that is approximately one-half or 15 one third of the length of the housing 2. In addition, one of the corner portions 2f may be chamfered, or both of the corner portions 2f and 2f may be chamfered. A size of a chamfering width of the corner portions 2f may be the same size as a width of the stepped surface 18, or may be smaller 20 than the width of the stepped surface 18. [0070] In addition, a corner portion 2g at which the groove formed surface 19 and the bottom surface 12 intersect each other may be chamfered, or any one or all of corner portions 25 2h and 2h between the first guided groove 22 and the second guide groove 23, corner portions 2i and 2i between the second guide groove 23 and the third guide groove 24, and a corner portion 2j between the third guide groove 24 and the rear surface 15 may be chamfered. In this case, the corner portions 2g, 30 2h, 2i, and 2j on one or both of the right and left sides in the housing 2 may be chamfered. SP368019WO00 28 [0071] The disposition recess 27 is formed by the recess formed surface 29. The recess formed surface 29 includes a base portion 29a, wall portions 29b and 29b, and an intermediate 5 portion 29c. In the recess formed surfaces 29 and 29, lower edges are respectively continuous to both right and left edges of the bottom surface 12, a distance from the bottom surface 12 to upper edges of the recess formed surfaces 29 and 29 is set to be greater than a distance from the bottom surface 12 10 to the upper edges 22a, 23a, and 24a. In addition, in the recess formed surfaces 29 and 29, the upper edges are respectively continuous to inner edges of the stepped surfaces 18 and 18, and a distance from the bottom surface 12 to the upper edges of the recess formed surfaces 29 and 29 is set 15 to be the same as a distance from the bottom surface 12 to the stepped surfaces 18 and 18. All of the lower edge 22b of the first guided groove 22, the lower edge 23b of the second guided groove 23, and the lower edge 24b of the third guided groove 24 are located on an upper side in comparison to the 20 lower edge of the groove formed surfaces 19, and positions in the upper and lower direction are set to be the same as each other. [0072] The base portion 29a is formed in a lateral U-shape that 25 is opened to the forward side, and is in a state of facing a horizontal direction. The wall portions 29b and 29b are continuous to a front end of the base portion 29a, and are formed as inclined surfaces which are spaced apart from each other in the right and left direction as they go toward the 30 forward side. That is, the wall portion 29b on the left side is formed as an inclined surface that approaches the left SP368019WO00 29 lateral surface 13 as it goes toward the forward side, and the wall portion 29b on the right side is formed as an inclined surface that approaches the right lateral surface 13 as it goes toward the forward side. Note that, in the wall portions 5 29b and 29b, one wall portion 29b may be formed as an inclined surface, and the other wall portion 29b may be formed as a surface that faces the leftward side or the rightward side without being inclined. The intermediate portion 29c faces the downward side and is formed between lower edges of the 10 wall portions 29b and 29b. For example, the wall portions 29b and 29b are inclined to 45 degrees with respect to a surface that faces the right and left direction. The intermediate portion 29c is located on the downward side in comparison to the stepped surface 18, is located at approximately the same 15 height as that of the upper edges 22a, 23a, and 24a of the first guided groove 22, the second guided groove 23, and the third guided groove 24, or is located on a slightly downward side in comparison to the upper edges 22a, 23a, and 24a. Note that, the intermediate portion 29c may be located on the upward 20 side in comparison to the upper edges 22a, 23a, and 24a. [0073] In the front end of the bottom portion 21, identification grooves 30 and 30 are formed to be laterally spaced apart from each other. The identification grooves 30 function as a 25 functional groove having a predetermined function, and identify, for example, the kind of a charger that functions as a connection device as described below, or the like. Note that, the functional groove is not limited to the identification grooves 30. As the functional groove, for 30 example, grooves having a function other than identification may be formed instead of the identification groove 30. SP368019WO00 30 Examples of the grooves include a positioning groove that performs positioning with respect to the charger or the like, and a detection groove or the like that detects a connection state or the like of the charger or the like. 5 [0074] However, when the predetermined function is the identification function of identifying the kind of the connection device, the kind of the connection device is identified by the functional groove. When the battery is 10 mounted in the connection device, or the battery enters a state of not being mounted in the connection device, it is possible to easily identify the kind of the connection device connected to the battery. [0075] 15 Note that, the predetermined function may be a function of identifying the kind of the battery itself. [0076] The identification grooves 30 and 30 are formed on sides opposite to each other with the disposition recess 27 20 interposed therebetween. In each of the identification grooves 30, a first identification portion 31 and a second identification portion 32 which have lengths different from each other in the front and rear direction are continuously formed in the right and left direction. 25 [0077] The first identification portion 31 and the second identification portion 32 respectively function as a first functional portion and a second functional portion. [0078] 30 Among surfaces which constitute the identification groove 30, a surface that is located on an upper side and faces SP368019WO00 31 the downward side is formed as an inner bottom surface 30a. The inner bottom surface 30a is located on the downward side in comparison to the intermediate portion 29c that is a surface that is located on an upper side in the recess formed surface 5 29 and faces the downward side. Accordingly, the depth of the identification groove 30 in the upper and lower direction is shallower than the depth of the disposition recess 27 in the upper and lower direction. In addition, the inner bottom surface 30a is located on the downward side in comparison to 10 the upper edges 22a, 23a, and 24a of the first guided groove 22, the second guided groove 23, and the third guided groove 24, and the stepped surface 18. In addition, the inner bottom surface 30a is located on the upward side in comparison to the lower edges 22b, 23b, and 24b of the first guided groove 15 22, the second guided groove 23, and the third guided groove 24. However, the inner bottom surface 30a may be located on the downward side in comparison to the lower edges 22b, 23b, and 24b, or may be located at the same height as that of the lower edges 22b, 23b, and 24b. 20 [0079] Among the surfaces which constitute the identification groove 30, a surface that is located on a rear side in the first identification portion 31 and faces the forward side is formed as a depth bottom surface 31a, and a surface that 25 is located on a rear side in the second identification portion 32 and faces the forward side is formed as a depth bottom surface 32a. The depth bottom surfaces 31a and 32a are located on the forward side in comparison to a surface, which is located on a rearmost side in the base portion 29a and faces the forward 30 side, in the recess formed surface 29, and is located on the rearward side in comparison to a front surface of a connector SP368019WO00 32 33. In addition, the depth bottom surfaces 31a and 32a are located on the forward side in comparison to a depth side bottom surface 36a of a terminal disposition groove 36 and a depth side bottom surface 37a of a positioning groove 37. In addition, 5 the depth bottom surfaces 31a and 32a are located on the forward side in comparison to a rear end edge of the first guided groove 22. However, the depth bottom surfaces 31a and 32a may be located on the rearward side in comparison to the rear end edge of the first guided groove 22 or may be located at the 10 same position as that of the rear end edge of the first guided groove 22 in the front and rear direction. [0080] The first identification portion 31 has a length longer than that of the second identification portion 32 in the front 15 and rear direction, the depth bottom surface 31a is located on a slightly rear side in comparison to the depth bottom surface 32a, and the first identification portion 31 is located on a further disposition recess 27 side in comparison to the second identification portion 32. It can be said that the second 20 identification portion 32 is located on a further lateral surface 13 side in comparison to the first identification portion 31. A width of the second identification portion 32 in the right and left direction is set to be smaller than a width of the first identification portion 31 in the right and 25 left direction. [0081] The connector 33 is disposed in the disposition recess 27 of the housing 2. The connector 33 is a portion that is connected to an electrode terminal of a charger that functions 30 as a connection device as described later, or the like, and functions as a terminal portion and includes a positive SP368019WO00 33 electrode terminal and a negative electrode terminal. [0082] The connector 33 includes a housing 34 formed from a non-conductive material, and connection terminals 35, 35, and 5 35 formed from a conductive material, and the connection terminals 35, 35, and 35 are held to the housing 34 in a state in which at least parts thereof are disposed in terminal disposition grooves 36, 36, and 36 formed in the housing 34. In each of the connection terminals 35, one end of a metal 10 piece includes a pair of contact portions which is laterally branched from a predetermined portion, and the pair of contact portions is disposed in each of the terminal disposition grooves 36 in a state in which tip ends have an elastic force in a direction of coming into contact with each other and come 15 into contact with each other or approach each other. [0083] The connection terminals 35, 35, and 35 function as a positive electrode terminal, a negative electrode terminal, and an information terminal, and are disposed in an arrangement 20 in which the positive electrode terminal, the information terminal, and the negative electrode terminal are arranged in this order from a left side, or an arrangement in which the positive electrode terminal, the information terminal, and the negative electrode terminal are arranged in this order 25 from a right side. [0084] The information terminal is used in order for a connection device as described later to recognize an internal temperature of the battery 1, and is used in order for the 30 connection device to recognize various pieces of information of the battery 1 such as a charging residual amount and SP368019WO00 34 deterioration information of the battery 1. [0085] Note that, two terminal disposition grooves 36 and 36, and two connection terminals 35 and 35 may be provided in the 5 connector 33. In a case where the two connection terminals 35 and 35 are provided, the two connection terminals 35 and 35 respectively function as the positive electrode terminal and the negative electrode terminal, and are disposed in an arrangement in which the positive electrode terminal and the 10 negative electrode terminal are arranged in this order from a left side, or an arrangement in which the positive electrode terminal and the negative electrode terminal are arranged in this order from a right side. In addition, four terminal , and four connection terminalsdisposition grooves 36, 36, may be provided in the connector 33. In a case15 35, 35, are provided,where the four connection terminals 35, 35, respectively functionthe four connection terminals 35, 35, as a positive electrode terminal, a negative electrode terminal, an information terminal, and a communication terminal, and 20 are disposed in an arrangement in which the positive electrode terminal, the information terminal, the communication terminal, and the negative electrode terminal are arranged in this order from the left side, in an arrangement in which the positive electrode terminal, the information terminal, 25 the communication terminal, and the negative electrode terminal are arranged in this order from the right side, in an arrangement in which the positive electrode terminal, the communication terminal, the information terminal, and the negative electrode terminal are arranged in this order from 30 the left side, or in an arrangement in which the positive electrode terminal, the communication terminal, the SP368019WO00 35 information terminal, and the negative electrode terminal are arranged in this order from the right side. The communication terminal is used in order for the connection device to recognize various pieces of information of the battery 1 such as the 5 charging residual amount and deterioration information of the battery 1, and in this case, the information terminal is used to notify the connection device of only temperature information. [0086] 10 The terminal disposition grooves 36, 36, and 36 are opened to the forward side and the downward side, and are formed to be laterally spaced apart from each other. The positioning grooves 37 and 37 which are opened to the forward side and the downward side are formed in the housing 34 on an outer 15 side of the terminal disposition grooves 36, 36, and 36 in the right and left direction. [0087] Portions between the terminal disposition grooves 36, 36, and 36 in the housing 34 of the connector 33 are provided 20 as terminal isolating ribs 34a and 34a, and portions between the terminal disposition grooves 36 and 36 and the positioning grooves 37 and 37 in the housing 34 are provided as inter-groove ribs 34b and 34b. A width of each of the terminal isolating ribs 34a in the right and left direction is set to be greater 25 than a width of each of the inter-groove ribs 34b in the right and left direction to prevent contact between the connection terminals 35, 35, and 35. [0088] A surface of each of the terminal disposition grooves 30 36 on the most top surface 11 side, and a surface of each of the positioning grooves 37 on the most top surface 11 side SP368019WO00 36 are respectively formed as the inner bottom surfaces 36a and 37a, and positions of the inner bottom surfaces 36a and 37a in the upper and lower direction are set to be approximately the same as each other. The inner bottom surfaces 36a and 5 37a are located on the downward side in comparison to the stepped surface 18. In addition, the inner bottom surfaces 36a and 37a are located on the downward side in comparison to the upper edge 22a of the first guided groove 22, the upper edge 23a of the second guided groove 23, and the upper edge 24a of the 10 third guided groove 24, and are located on the upward side in comparison to the lower edge 22b of the first guided groove 22, the lower edge 23b of the second guided groove 23, and the lower edge 24b of the third guided groove 24. [0089] 15 Each of the connection terminals 35 is elastically deformable in approximately the right and left direction, and is held to the housing 34 in a state of being inserted into each of the terminal disposition grooves 36. [0090] 20 Note that, description has been given of an example in which in the recess formed surface 29, upper ends of the wall portions 29b and 29b, and the intermediate portion 29c are located at the same height as that of an upper end of the housing 34 of the connector 33. However, for example, the upper ends 25 of the wall portions 29b and 29b and the intermediate portion 29c may be located on the upward side in comparison to the upper end of the housing 34 (refer to Fig. 14). In this case, the upper ends of the wall portions 29b and 29b and the intermediate portion 29c may be located at an arbitrary 30 position at lower positions biased to the upper end of the housing 2. SP368019WO00 37 [0091] In addition, in the recess formed surface 29, for example, the intermediate portion 29c may not exist, and the wall portions 29b and 29b may be formed at positions ranging from 5 the upper end to the lower end of the housing 2 (refer to Fig. 15 and Fig. 16). [0092] In addition, the wall portions 29b and 29b which are inclined in the front, rear, left, and right directions may 10 not be formed, and first wall surface portions 29x and 29x which face the forward side, and second wall surface portions 29y and 29y which are continuous to outer edges of the first wall surface portions 29x and 29x in the right and left direction, and are opposite to each other in the right and left direction 15 may be formed instead of the wall portions 29b and 29b (refer to Fig. 17 and Fig. 18). Note that, the first wall surface portions 29x and 29x and the second wall surface portions 29y and 29y may be inclined at an arbitrary angle in the right and left direction, the front and rear direction, or the upper 20 and lower direction. [0093] In the connector 33, ends of the connection terminals 35, 35, and 35 on one side are connected to the circuit substrate 9 disposed at the inside of the housing 2 through disposition 25 holes 28. [0094] In a state in which the connector 33 is disposed in the disposition recess 27, a front surface 33a is located on a rear side in comparison to the front surface 14 of the housing 30 2. The connector 33 is located in a region surrounded by the base portion 29a of the recess formed surface 29 in the SP368019WO00 38 disposition recess 27, and the wall portions 29b and 29b and the intermediate portion 29c of the recess formed surface 29 are located in front of the connector 33. [0095] 5 In a state in which the connector 33 is disposed in the disposition recess 27, a lower surface 33b is located on the same plane as that of the bottom surface 12 of the housing 2. [0096] 10 Next, description will be given of an imaging device (still camera) 50 as an example of a connection device to which the battery 1 is connected (refer to Fig. 19 to Fig. 21). [0097] 15 For example, in the imaging device 50, respective necessary units are disposed on an inner side and on an outer side of a laterally long flat outer housing 51 (refer to Fig. 19). An accessary such as an exchange lens 70 and an adapter (not illustrated) is detachable from the imaging device 50. 20 Operation rings 71, 72, and 73 which are operated to rotate are provided in the exchange lens 70. The operation rings 71, 72, and 73 function as a focus ring for performing focusing, a zoom lens ring for adjusting an angle of view, and an iris ring for performing adjustment of a light amount. 25 [0098] are provided on anVarious operation units 52, 52, upper surface of the outer housing 51. As the operation units , for example, a photographing button, a zoom knob,52, 52, a power button, a mode selection knob, and the like are provided. 30 A flash 53 capable being put in and out is provided in an upper end of the outer housing 51. SP368019WO00 39 [0099] A finder 54 is provided at the upper end of the outer housing 51 on a rear side of the flash 53. A display 55 and are provided on a rear surfacevarious operation units 52, 52, 5 of the outer housing 51 (refer to Fig. 20). [0100] An imaging element (not illustrated) is disposed at the inside of the outer housing 51. As the imaging element, for example, a charge coupled device (CCD), a complementary 10 metal-oxide semiconductor (CMOS), or the like is used. [0101] A battery mounting portion 56 is provided at a rearward portion on the rearward side in comparison to a mount (not illustrated) to which the exchange lens is connected at one 15 end of the imaging device 50 in a right and left direction, or the imaging element (refer to Fig. 20 and Fig. 21). [0102] The battery mounting portion 56 includes a part of the outer housing 51 and a lid member 57 that is rotatable at a 20 lower end of the outer housing 51. In the battery mounting portion 56, an internal space is formed as a mounting space 56a, and the mounting space 56a is opened to the downward side. [0103] A biasing spring 58 and a terminal connection portion 25 59 are disposed in a deep portion (upper end) of the battery mounting portion 56. The terminal connection portion 59 includes a support portion 60 that is formed from a non-conductive material, and electrode terminals 61, 61, and 61 which are formed from a conductive material, and the 30 electrode terminals 61, 61, and 61 are held to the support portion 60 in a state of being laterally spaced apart from SP368019WO00 40 each other. [0104] Positioning protrusions 60a and 60a are provided in the support portion 60 on an outer side of the electrode terminals 5 61, 61, and 61 in the right and left direction. [0105] In the terminal connection portion 59, ends on one side of the electrode terminals 61, 61, and 61 are connected to a control substrate (not illustrated) that is disposed at the 10 inside of the outer housing 51. [0106] A pressing lever 62 is rotatably supported to an opening edge of the mounting space 56a at a lower end of the battery mounting portion 56. The pressing lever 62 is rotatable 15 between a pressing position and non-pressing position, and is pressed by a spring (not illustrated) in a direction, for example, from the non-pressing position to the pressing position. [0107] 20 Erroneous insertion prevention protrusions 56b and 56b are provided at the inside of the battery mounting portion 56. The battery mounting portion 56 is provided with a locking mechanism that locks the lid member 57 in a closed state of the mounting space 56a. 25 [0108] Hereinafter, description will be given of mounting of the battery 1 to the battery mounting portion 56 of the imaging 30 device 50 (refer to Fig. 22 to Fig. 24). [0109] SP368019WO00 41 In a state in which the lid member 57 is opened, as described below, a user inserts the battery 1 into the mounting space 56a to mount the battery 1 in the battery mounting portion 56. 5 [0110] The battery 1 is inserted into the mounting space 56a from the front surface 14 side (refer to Fig. 22). At this time, the battery 1 is inserted into the mounting space 56a in a direction in which the notches 2a and 2a match the erroneous 10 insertion prevention protrusions 56b and 56b. Accordingly, when inserting the battery 1 into the mounting space 56a in a direction in which the notches 2a and 2a do not match the erroneous insertion prevention protrusions 56b and 56b, for example, the inclined surfaces 16 which are corner portions 15 formed by a part of the housing 2, for example, the top surface 11 and the lateral surface 13 come into contact with the erroneous insertion prevention protrusions 56b and 56b, and erroneous insertion of the battery 1 into the mounting space 56a is prevented. 20 [0111] Insertion of the battery 1 into the mounting space 56a is performed in a state in which the pressing lever 62 is rotated to the non-pressing position. When the battery 1 is inserted into the mounting space 56a, the pressing lever 62 enters a 25 state in which the pressing lever 62 slides to one of the lateral surfaces 13 of the battery 1, and thus rotation of the pressing lever 62 to the pressing position is regulated. [0112] In the battery 1 inserted into the mounting space 56a, 30 the connection terminals 35, 35, and 35 of the connector 33 are respectively connected to the electrode terminals 61, 61, SP368019WO00 42 and 61 of the terminal connection portion 59. At this time, each of the electrode terminals 61 is inserted between a pair of contact portions which is laterally branched in each of the connection terminals 35 and has elasticity in a direction 5 in which the contact portions come into contact with each other, and thus the connection terminal 35 is connected to the electrode terminal 61 in a state in which the pair of contact portions pinches the electrode terminal 61 from both right and left sides. In addition, at this time, the positioning 10 protrusions 60a and 60a of the terminal connection portion 59 are respectively inserted into the positioning grooves 37 and 37 of the connector 33, and thus positioning of the connector 33 with respect to the terminal connection portion 59 is performed. 15 [0113] In a state in which the connection terminals 35, 35, and 35 are respectively connected to the electrode terminals 61, 61, and 61, in the mounting space 56a, the rear surface 15 is located on a deeper side in comparison to the pressing 20 lever 62, the pressing lever 62 is rotated to a pressing position by a biasing force of the spring, and the front surface 14 is pressed by the biasing spring 58. With this arrangement, the battery 1 is biased to the rearward side (refer to Fig. 23). Accordingly, a pressed portion 15a (refer to Fig. 22) 25 provided on the rear surface 15 of the battery 1 is pressed to the pressing lever 62, and detachment from the mounting space 56a is regulated. The pressed portion 15a is located on a further top surface 11 side in comparison to the notch 2a. 30 [0114] As described above, in a state in which detachment of SP368019WO00 43 the battery 1 from the mounting space 56a is regulated due to the pressing lever 62, the mounting space 56a is closed by the lid member 57. With this arrangement, the battery 1 is mounted in the battery mounting portion 56. At this time, 5 the lid member 57 is locked to the outer housing 51 by a locking mechanism. [0115] On the other hand, when the locking of the lid member 57 with respect to the outer housing 51 is released, the lid 10 member 57 is rotated to open the mounting space 56a, and the pressing lever 62 is rotated to the non-pressing position, the battery 1 is taken out from the mounting space 56a, and thus it is possible to take out the battery 1 from the battery mounting portion 56. 15 [0116] Note that, description has been given of an example in which the pressed portion 15a of the rear surface 15 is pressed to the pressing lever 62, and thus detachment of the battery 1 from the mounting space 56a is regulated. However, it is 20 also possible to employ a configuration in which a pressed recess 38 that is opened at least to the rearward side is formed in the rear end of the battery 1, and a part of the pressing lever 62 is inserted into the pressed recess 38 to regulate detachment of the battery 1 from the mounting space 56a (refer 25 to Fig. 24). [0117] As described above, when the pressed recess 38 into which a part of the pressing lever 62 is inserted is formed in the battery 1, it is possible to locate the pressing lever 62 on 30 a deeper side of the mounting space 56a, and thus it is possible to realize a reduction in size of the imaging device 50 in SP368019WO00 44 proportion to the location on the deeper side. [0118] Next, as another example of the connection device to 5 which the battery 1 is connected, a charger 80 will be described (refer to Fig. 25 to Fig. 29). Note that, the charger 80 is a device different from the imaging device 50 and the like, but the following connection structure of the charger 80 may be provided integrally with various devices such as the imaging 10 device. Accordingly, the battery 1 can be connected to the imaging device and the like in which the following connection structure of the charger 80 is provided. [0119] In the charger 80, respective necessary units are 15 disposed on an inner side and on an outer side of a case body 81. The following connection structure is provided in the case body 81. [0120] The case body 81 is formed in an approximately 20 rectangular parallelepiped shape, approximately the half on one side in a right and left direction is provided as a mechanism disposition portion 82, and approximately the half on the other side in the right and left direction is provided as a battery mounting portion 83. 25 [0121] A substrate, a light-emitting body such as a light-emitting diode, and the like (not illustrated) are disposed at the inside of the mechanism disposition portion 82. Windows 82a and 82b are provided in a top surface portion 30 of the mechanism disposition portion 82. Light emitted from the light-emitting diode is emitted toward the outside through SP368019WO00 45 the windows 82a and 82b, and it is possible to recognize a charging operation state, a charging amount state, and the like with emission state through the windows 82a and 82b. [0122] 5 A mounting recess 83a that is opened to the upward side and the rearward side is formed in the battery mounting portion 83. Stepped portions 84 and 84 are provided on both right and left sides of the mounting recess 83a, and the stepped portions 84 and 84 are formed in a shape that protrudes toward 10 the upward side and extends in a front and rear direction. The stepped portions 84 and 84 include flat surfaces 84a and 84a which face the upward side, and opposing surfaces 84b and 84b which are continuous to inner edges of the flat surfaces 84a and 84a and face each other. Note that, a battery having 15 a configuration in which only one notch 2a is formed in a housing also exists, but in the case of a battery mounting portion to which the battery is mounted, one stepped portion 84 may be provided. [0123] 20 The mounting recess 83a is formed by respective surface portions including a bottom plate surface portion 85 that is located between the stepped portions 84 and 84 and faces the upward side, and a front plate surface portion 86 that faces the rearward side in addition the stepped portions 84 and 84, 25 and the front plate surface portion 86 is continuous to front edges of the stepped portions 84 and 84 and a front edge of the bottom plate surface portion 85. First guide engagement portions 87 and 87, second guide engagement portions 88 and 88, and third guide engagement portions 89 and 89 are provided 30 in the stepped portions 84 and 84 in this order from the front side in a state of being spaced apart from each other in the SP368019WO00 46 front and rear direction. All of the first guide engagement portions 87 and 87, the second guide engagement portions 88 and 88, and the third guide engagement portions 89 and 89 protrude from the opposing surfaces 84b and 84b in a direction 5 of approaching each other. [0124] Each of the first guide engagement portions 87 is formed in a protruding shape that extends in the front and rear direction, a front end is continuous to the front plate surface 10 portion 86, and protrudes from an intermediate portion of each of the opposing surfaces 84b in the upper and lower direction. Each of the second guide engagement portions 88 is formed in a protruding shape that extends in the front and rear direction, and is located at the same height as that of the first guide 15 engagement portion 87. Each of the third guide engagement portions 89 includes an engagement portion 89a that extends in the front and rear direction, and an erecting wall portion 89b that protrudes downward from a front end of the engagement portion 89a, and a lower end of the erecting wall portion 89b 20 is continuous to the bottom plate surface portion 85. [0125] Note that, in the case of mounting a battery of a type in which only the first guided groove 22 and the third guided groove 24 are formed on one side in a right and left direction, 25 only the second guided groove 23 is formed on the other side in the right and left direction, and thus the guided grooves are alternately formed on the left side and on the right side, only guide engagement portions corresponding to the guided grooves may be provided. For example, in the case of mounting 30 a battery in which only the first guided groove 22 and the third guided groove 24 are formed on one side in the right SP368019WO00 47 and left direction, and only the second guided groove 23 is formed on the other side in the right and left direction, only the first guide engagement portion 87 and the third guide engagement portion 89 may be provided on one side in the right 5 and left direction, and only the second guide engagement portion 88 may be provided on the other side in the right and left direction. [0126] An identification protrusion 90 that protrudes upward 10 from a front end of the bottom plate surface portion 85 is provided in the battery mounting portion 83. In the identification protrusion 90, a long portion 90a and a short portion 90b, which have lengths different from each other in the front and rear direction, are provided continuously in 15 the right and left direction, and the length of the long portion 90a in the front and rear direction is set to be longer than the length of the short portion 90b in the front and rear direction. A lateral width of the long portion 90a is set to be smaller than a lateral width of the short portion 90b. 20 [0127] The identification protrusion 90 is provided at a position at which a front end is continuous to the front plate surface portion 86, and is biased to the first guide engagement portion 87 on one side in the right and left direction. 25 Specifically, in the right and left direction, the identification protrusion 90 is located on a side that is closer to the first guide engagement portion 87 on one side in comparison to the center of an interval between the center of the bottom plate surface portion 85 and the first guide 30 engagement portion 87 on one side, and is located on a side that is closer to the first guide engagement portion 87 on SP368019WO00 48 one side in comparison to the center of an interval between a terminal connection portion 93 and the first guide engagement portion 87 on one side. In the identification protrusion 90, the short portion 90b is located on a further first guide 5 engagement portion 87 side on one side in comparison to the long portion 90a. [0128] A detection protrusion 91 that is movable in the front and rear direction is provided at a front end of the battery 10 mounting portion 83. The detection protrusion 91 is biased rearward by a spring member (not illustrated), and is provided at a position biased to the first guide engagement portion 87 on the other side in the right and left direction. [0129] 15 Note that, when the center of the bottom plate surface portion 85 in the right and left direction is set as a reference, the detection protrusion 91 may be provided at a symmetric position that is biased to the first guide engagement portion 87 on one side. In addition, description has been given of 20 an example in which the identification protrusion 90 and the detection protrusion 91 are located at opposite sides in the right and left direction with the terminal connection portion 93 interposed therebetween. Both the identification protrusion 90 and the detection protrusion 91 may be located 25 on the left side or on the right side of the terminal connection portion 93. In this case, the terminal connection portion 93 and the detection protrusion 91 are located at opposite sides in the right and left direction with the identification protrusion 90 interposed therebetween. 30 [0130] A part of the bottom plate surface portion 85 is provided SP368019WO00 49 as an engagement maintaining portion 92. The engagement maintaining portion 92 is a portion on an inner side of a lateral U-shaped slit formed at a part of the bottom plate surface portion 85, and is set to be elastically deformable in an 5 approximately vertical direction with a front end set as a fulcrum. A locking protrusion 92a that protrudes upward is formed at a rear end of the engagement maintaining portion 92. [0131] 10 The terminal connection portion 93 is disposed at the front end of the battery mounting portion 83. The terminal connection portion 93 includes a support portion 94 that is formed from a non-conductive material and electrode terminals 95, 95, and 95 which are formed from a conductive material, 15 and the electrode terminals 95, 95, and 95 are held to the support portion 94 in a state of being laterally spaced apart from each other. [0132] The support portion 94 is provided with positioning 20 protrusions 94a and 94a on outer sides of the electrode terminals 95, 95, and 95 in the right and left direction. The size of the width of the positioning protrusions 94a and 94a in the right and left direction is greater than the size of the width of the electrode terminals 95, 95, and 95 in the 25 right and left direction. [0133] In the terminal connection portion 93, ends of the electrode terminals 95, 95, and 95 on one side are connected to a substrate that is disposed at the inside of the case body 30 81. [0134] SP368019WO00 50 Hereinafter, description will be given of mounting of the battery 1 to the battery mounting portion 83 in the charger 80 (refer to Fig. 29 to Fig. 31). 5 [0135] As described below, a user can mount the battery 1 to the battery mounting portion 83 by inserting a part of the battery 1 into the mounting recess 83a. [0136] 10 The battery 1 is inserted into the mounting recess 83a from the upward side (refer to Fig. 29). At this time, the second guide engagement portions 88 and 88 are respectively inserted into the second guided grooves 23 and 23 through the insertion grooves 25 and 25, and the engagement portions 89a 15 and 89a of the third guide engagement portions 89 and 89 are respectively inserted into the third guided grooves 24 and 24 through the insertion grooves 26 and 26. Accordingly, the stepped portions 84 and 84 of the charger 80 are inserted into the notches 2a and 2a of the battery 1, the stepped surfaces 20 18 and 18 are respectively located to face the flat surfaces 84a and 84a in the upper and lower direction, and the groove formed surfaces 19 and 19 are respectively located to face the opposing surfaces 84b and 84b in the right and left direction. 25 [0137] At this time, the battery 1 is disposed on the bottom plate surface portion 85 from the upward side, and thus the locking protrusion 92a of the engagement maintaining portion 92 is pressed downward, and is elastically deformed. 30 [0138] Note that, when inserting the battery 1 into the mounting SP368019WO00 51 recess 83a in a direction in which the stepped portions 84 and 84 are not inserted into the notches 2a and 2a, a part of the housing 2 comes into contact with the stepped portions 84 and 84, and thus erroneous insertion of the battery 1 into 5 the mounting recess 83a is prevented. [0139] Next, the battery 1 slides forward with respect to the charger 80 (refer to Fig. 30). When the battery 1 slides to the forward side, the first guided grooves 22 and 22 are 10 respectively guided to the first guide engagement portions 87 and 87, the second guided grooves 23 and 23 are respectively guided to the second guide engagement portions 88 and 88, and the third guided grooves 24 and 24 are respectively guided to the engagement portions 89a and 89a of the third guide 15 engagement portions 89 and 89. The battery 1 slides forward up to a movement edge at which rear opening edges of the third guided grooves 24 and 24 respectively come into contact with the erecting wall portions 89b and 89b of the third guide engagement portions 89 and 89. 20 [0140] In a state in which the battery 1 slides forward up to the movement edge, opening edges of the first guided grooves 22 and 22 respectively engage with the first guide engagement portions 87 and 87, opening edges of the second guided grooves 25 23 and 23 respectively engage with the second guide engagement portions 88 and 88, and opening edges of the third guided grooves 24 and 24 respectively engage with the engagement portions 89a and 89a of the third guide engagement portions 89 and 89. Accordingly, an upper edge of the first engagement claw portion 30 2p engages with at least a part of a lower edge of the first guide engagement portion 87, an upper edge of the second SP368019WO00 52 engagement claw portion 2q engages with at least a part of a lower edge of the second guide engagement portion 88, and an upper edge of the third engagement claw portion 2r engages with at least a part of a lower edge of the third guide engagement 5 portion 89. [0141] At this time, a rear end edge of the battery 1 is located in front of the locking protrusion 92a of the engagement maintaining portion 92, the engagement maintaining portion 10 92 is elastically returned and the locking protrusion 92a engages with a lower end of the rear end edge in the battery 1, and thus the battery 1 is mounted in the battery mounting portion 83. [0142] 15 When the battery 1 is mounted in the battery mounting portion 83, the detection protrusion 91 of the charger 80 is pressed and operated by a detection pressed portion 14a that is provided on the front surface 14 of the battery 1. The detection protrusion 91 moves forward, and when the detection 20 protrusion 91 moves forward, mounting of the battery 1 to the battery mounting portion 83 is detected by a detection unit (not illustrated). [0143] When mounting of the battery 1 to the battery mounting 25 portion 83 is detected, in a state in which the charger 80 is connected to a power supply, light is emitted from the light-emitting diode and is emitted upward through the windows 82a and 82b. Accordingly, a user can recognize whether or not it is a chargeable state or a charging amount with respect 30 to the battery 1 by visually confirming a state of the light that is emitted through the windows 82a and 82b. SP368019WO00 53 [0144] In addition, when the battery 1 is mounted in the battery mounting portion 83, the identification protrusion 90 of the charger 80 is inserted into the identification groove 30 on 5 one side of the battery 1 (refer to Fig. 31). In the identification protrusion 90, the long portion 90a is inserted into the first identification portion 31, and the short portion 90b is inserted into the second identification portion 32. [0145] 10 When the identification protrusion 90 is inserted into the identification groove 30, whether or not the battery 1 mounted in the battery mounting portion 83 is a type capable of being charged by the charger 80 is identified. For example, the battery 1 is a type in which power capacity that can be 15 charged is approximately intermediate. [0146] In addition, when the battery 1 is mounted in the battery mounting portion 83, the terminal connection portion 93 of the charger 80 is inserted between the wall portions 29b and 20 29b of the battery 1. At this time, an interval, a dimension tolerance, or the like for securing a smooth insertion property of the battery 1 with respect to the battery mounting portion 83 exists between the battery 1 and the charger 80, and thus the battery 1 may be inserted into the battery mounting portion 25 83 in a state in which the battery 1 is laterally inclined or displaced with respect to the charger 80 (refer to Fig. 32). [0147] Even in a case where the battery 1 is inserted in an 30 inclined state or a displaced state with respect to the charger 80, since the wall portions 29b and 29b are formed as inclined SP368019WO00 54 surfaces which are spaced apart from each other in the right and left direction as they go forward, the terminal connection portion 93 is guided to the wall portions 29b and 29b, and approaches the connector 33. Accordingly, in the battery 1, 5 the connection terminals 35, 35, and 35 of the connector 33 are reliably connected to the electrode terminals 95, 95, and 95 of the terminal connection portion 93, respectively (refer to Fig. 33). At this time, the positioning protrusions 94a and 94a of the terminal connection portion 93 are respectively 10 inserted into the positioning grooves 37 and 37 of the connector 33, and positioning of the connector 33 with respect to the terminal connection portion 93 is performed. [0148] On the other hand, when the battery 1 is caused to slide 15 rearward to release engagement of the locking protrusion 92a with the rear end edge of the battery and to release engagement of the first guide engagement portions 87 and 87, the second guide engagement portions 88 and 88, and the third guide engagement portions 89 and 89, and the battery 1 is taken out 20 upward from the mounting recess 83a, whereby the battery 1 can be taken out from the battery mounting portion 83. [0149] As described above, in the battery 1, a surface that 25 forms the disposition recess 27 of the housing 2 is formed as the recess formed surface 29, and the intermediate portion 29c that is a part of the recess formed surface 29 exists between the front surface 14 of the outer surface 10 and the connector 33. 30 [0150] Accordingly, since the front surface 33a of the connector SP368019WO00 55 33 is located on an inner side in the housing 2 in comparison to the front surface 14 of the housing 2, occurrence of breakage or damage of the connector 33 when being dropped or the like is reduced, and thus it is possible to secure a satisfactory 5 connection state of the connection terminals 35 with respect to the electrode terminals 61 or 95. [0151] Particularly, an impact force due to dropping impact is less likely to be transferred to the connector 33, and thus 10 cracks are less likely to occur in solder for connecting the connection terminals 35 to the circuit substrate 9, and it is possible to reduce occurrence of electrical connection failure. [0152] 15 In addition, since occurrence of breakage or damage of the connector 33 is reduced, the connection terminals 35 are less likely to be exposed form the housing 34, and it is possible to secure high quality of the connector 33. [0153] 20 Note that, description has been given of an example in which the front surface 33a of the connector 33 is located on an inner side in the housing 2 in comparison to the front surface 14 of the housing 2. However, for example, the lower surface 33b of the connector 33 may be located on an inner 25 side in the housing 2 in comparison to the bottom surface 12 of the housing 2 (refer to Fig. 34). [0154] As described above, in a case where the lower surface 33b of the connector 33 is located on an inner side in the 30 housing 2 in comparison to the bottom surface 12 of the housing 2, occurrence of breakage or damage of the connector 33 when SP368019WO00 56 being dropped or the like is reduced, and thus it is possible to secure a satisfactory connection state of the connection terminals 35 with respect to the electrode terminals 61 or 95. 5 [0155] In addition, for example, the front surface 33a of the connector 33 may be located on an inner side in the housing 2 in comparison to the front surface 14 of the housing 2, and the lower surface 33b of the connector 33 may be located on 10 an inner side in the housing 2 in comparison to the bottom surface 12 of the housing 2 (refer to Fig. 35). [0156] As described above, in a case where the front surface 33a is located on an inner side in the housing 2 in comparison 15 to the front surface 14, and the lower surface 33b is located on an inner side in the housing 2 in comparison to the bottom surface 12, the entirety of the connector 33 is located on an inner side in the housing 2. Accordingly, occurrence of breakage or damage of the connector 33 when being dropped or 20 the like is further reduced, and thus it is possible to secure a satisfactory connection state of the connection terminals 35 with respect to the electrode terminals 61 or 95. [0157] In addition, in the battery 1, the disposition recess 25 27 is opened in a connection direction of the connection terminals 35 with respect to the electrode terminals 61 or 95, and the intermediate portion 29c that is the recess formed surface 29 exists between the outer surface 10 and the connector 33 in the connection direction. 30 [0158] Accordingly, since the connector 33 is located on an SP368019WO00 57 inner side in the housing 2 in comparison to the outer surface 10 in the connection direction, the electrode terminals 61 or 95 are inserted up to a deeper side of the disposition recess 27, and thus it is possible to realize a reduction in size 5 of the connection devices (imaging device 50 and the charger 80) in the connection direction. [0159] In addition, a part of the recess formed surface 29 is formed as an inclined surface in which an opening area of the 10 disposition recess 27 increases as it is spaced apart from the connector 33 in an opening direction (connection direction) of the disposition recess 27. [0160] Accordingly, the part of the recess formed surface 29 15 functions as a guide surface during insertion of the electrode terminals 61 or 95 into the disposition recess 27, and thus it is possible to secure a satisfactory connection state between the connection terminals 35 and the electrode terminals 61 or 95. 20 [0161] In addition, the recess formed surface 29 includes the pair of wall portions 29b and 29b which is located to be spaced apart from each other in a direction that is perpendicular to the connection direction, and the wall portions 29b and 25 29b are formed as inclined surfaces which are spaced apart from each other as they go along the connection direction. [0162] Accordingly, since the wall portions 29b and 29b function as guide surfaces during insertion of the electrode terminals 30 61 or 95 into the disposition recess 27, it is possible to secure a further satisfactory connection state between the SP368019WO00 58 connection terminals 35 and the electrode terminals 61 or 95. [0163] Note that, description has been given of an example in which the pair of wall portions 29b and 29b is formed as inclined 5 surfaces which are spaced apart from each other as it goes along the connection direction. However, for example, the wall portion 29b on one side may be formed as an inclined surface in which an opening area of the disposition recess 27 increases as it goes along the connection direction (refer to Fig. 36). 10 [0164] In addition, in the battery 1, the intermediate portion 29c of the recess formed surface 29 may be formed as an inclined surface in which an opening area of the disposition recess 27 increases as it is spaced apart from the connector 33 in 15 the connection direction (refer to Fig. 37). [0165] As described above, when the intermediate portion 29c is formed as the inclined surface, the intermediate portion 29c functions as a guide surface during insertion of the 20 electrode terminals 61 or 95 into the disposition recess 27, and thus it is possible to secure a further satisfactory connection state between the connection terminals 35 and the electrode terminals 61 or 95. [0166] 25 Note that, in this case, the wall portions 29b and 29b may be formed as inclined surfaces in addition to the intermediate portion 29c, the wall portion 29b on one side may be formed as an inclined surface in addition to the intermediate portion 29c, or only the intermediate portion 30 29c may be formed as an inclined surface. [0167] SP368019WO00 59 In addition, an inclination angle of the wall portion 29b or the intermediate portion 29c with respect to the connection direction is arbitrary. However, for example, it is preferable that the inclination angle is set to be greater . and equal to or less than 455 than 0 [0168] When the inclination angle of the wall portion 29b or andthe intermediate portion 29c is set to be greater than 0 , an inclination angle of the recessequal to or less than 45 10 formed surface 29 that functions as a guide surface forms an acute angle, and thus it is possible to smoothly insert the electrode terminals 61 or 95 which are guided by the guide surface into the disposition recess 27. [0169] 15 Note that, description has been given of the charger 80 of a type in which the battery 1 is inserted into the mounting recess 83a from the upward side and is caused to slide forward to be mounted as an example. However, as another type, a charger 80A into which the battery 1 is inserted from the upward 20 side and is mounted therein exists (refer to Fig. 38). [0170] For example, in the charger 80A, the entirety thereof is provided as a battery mounting portion 83A, and a mounting recess 83b that is opened to the upward side is formed in the 25 battery mounting portion 83A. A terminal connection portion 96 including electrode terminals is disposed in the battery mounting portion 83A. The battery 1 is inserted into the mounting recess 83b of the charger 80A in a direction in which the front surface 14 faces the downward side. 30 [0171] In this case, when at least one of the wall portions SP368019WO00 60 29b and 29b of the battery 1, or the intermediate portion 29c is formed as an inclined surface (guide surface), the terminal connection portion 96 is guided to the inclined surface due to own weight of the battery 1 during insertion of the battery 5 1 into the mounting recess 83b. [0172] Accordingly, it is possible to secure an easy and satisfactory connection state of the battery 1 with respect to the charger 80A. 10 [0173] With regard to the battery 1, the notch 2a is formed in the housing 2 due to the stepped surface 18 that is continuous to the lateral surface 13 and the groove formed surface 19 that is continuous to the bottom surface 12, the first guided 15 groove 22, the second guided groove 23, and the third guided groove 24 which are opened to the groove formed surface 19 are formed, and the first guided groove 22, the second guided groove 23, and the third guided groove 24 are located on a further bottom surface 12 side in comparison to the stepped 20 surface 18. [0174] Accordingly, the first guided groove 22, the second guided groove 23, and the third guided groove 24, and the stepped surface 18 are not continuously located, and a part of the 25 groove formed surface 19 is located between the first guided groove 22, the second guided groove 23, and the third guided groove 24, and the stepped surface 18. Accordingly, the groove formed surface 19 and the stepped surface 18 are closer to the cells 6 in comparison to a case where the first guided 30 groove 22, the second guided groove 23, and the third guided groove 24, and the stepped surface 18 are continuously located, SP368019WO00 61 and thus it is possible to realize a reduction in size of the battery 1. [0175] In addition, the notches 2a and 2a are respectively 5 formed at positions which are continuous to the two lateral surfaces 13 and 13. Accordingly, the notches 2a and 2a exist on both sides of the two lateral surfaces 13 and 13, and the outer surface 10 of the housing 2 is located to be close to the cells 6 and 6 at two sites. As a result, it is possible 10 to realize a further reduction in size of the battery 1. [0176] In addition, the first guided grooves 22 and 22, the second guided grooves 23 and 23, and the third guided grooves 24 and 24 are formed to be spaced apart from each other in 15 the connection direction of the connection terminals 35 with respect to the electrode terminals 61 or 95. Accordingly, portions in the housing 2 between the first guided groove 22, the second guided groove 23, and the third guided groove 24 are formed as protrusions with respect to the first guided 20 groove 22, the second guided groove 23, and the third guided groove 24, and thus the protrusion functions as s reinforcing rib. As a result, it is possible to realize improvement in the strength of the housing 2. [0177] 25 Hereinafter, another configuration example of the battery 1 will be described (refer to Fig. 39 to Fig. 44). [0178] Engagement recesses 39 and 39 may be formed in the battery 30 1 at least on both right and left sides (refer to Fig. 39). For example, the engagement recesses 39 and 39 are respectively SP368019WO00 62 opened to the second guided grooves 23 and 23. [0179] The battery 1 in which the engagement recesses 39 and 39 are formed is connected, for example, in a state of being 5 held to the charger 80B. The charger 80B includes a main body 97, holding arms 98 and 98 which protrude rearward from the main body 97, and a terminal connection portion 99 that is disposed in the main body 97 in a state of protruding rearward and includes electrode terminals. 10 [0180] An operation button 97a is disposed in the main body 97, and when the operation button 97a is operated, the holding arms 98 and 98 are operated in a direction in which the holding arms 98 and 98 are spaced apart from each other. 15 [0181] In the holding arms 98 and 98, tip ends thereof are provided as engagement protrusions 98a and 98a which are bent in a direction of approaching each other. Sliding surfaces 98b and 98b which are inclined in a direction of approaching 20 each other as they approach the main body 97 are formed in the holding arms 98 and 98. The holding arms 98 and 98 are biased in a direction of approaching each other by a spring (not illustrated) that is disposed at the inside of the main body 97. 25 [0182] When the battery 1 moves forward with respect to the charger 80B, front edges of the battery 1 slide on the sliding surfaces 98b and 98b, the holding arms 98 and 98 move in a direction of being spaced apart from each other against a 30 biasing force of the spring, and the holding arms 98 and 98 are respectively inserted into the first guided grooves 22 SP368019WO00 63 and 22. The holding arms 98 and 98 relatively move from the first guided grooves 22 and 22 toward the second guided grooves 23 and 23, respectively, move from the first guided grooves 22 and 22 in a direction of approaching each other in a state 5 of riding on the groove formed surfaces 19 and 19 at once to be inserted into the second guided grooves 23 and 23, and the engagement protrusions 98a and 98a respectively engage with the engagement recesses 39 and 39 (refer to Fig. 40). [0183] 10 The charger 80B enters a state in which the engagement protrusions 98a and 98a respectively engage with the engagement recesses 39 and 39, and the battery 1 is pinched from both right and left sides, and the battery 1 is held to the charger 80B. When the engagement protrusions 98a and 98a respectively 15 engage with the engagement recesses 39 and 39, the connector 33 is simultaneously connected to the terminal connection portion 99. [0184] In the case of releasing holding of the battery 1 by 20 the charger 80B, the operation button 97a is operated and the holding arms 98 and 98 are moved in a direction of being spaced apart from each other to release an engagement state of the engagement protrusions 98a and 98a with respect to the engagement recesses 39 and 39. With this arrangement, it is 25 possible to detach the battery 1 and the charger 80B from each other. [0185] Note that, description has been given of an example in which the engagement recesses 39 and 39 are respectively opened 30 to the second guided grooves 23 and 23, but the engagement recesses 39 and 39 may be respectively opened to the third SP368019WO00 64 guided grooves 24 and 24. However, in a case where the engagement recesses 39 and 39 are respectively opened to the second guided grooves 23 and 23, the engagement protrusions 98a and 98a of the charger 80B are guided in a state of being 5 inserted into the guided grooves 23 and 23, and thus the engagement protrusions 98a and 98a can reliably engage with the engagement recesses 39 and 39. [0186] As described above, since the engagement recesses 39 10 and 39 which are respectively opened to surfaces facing opposite directions in the housing 2 and with which the engagement protrusions 98a and 98a respectively engage are formed, it is possible to hold the battery 1 by causing the engagement protrusions 98a and 98a to respectively engage with 15 the engagement recesses 39 and 39 from opposite sides, and it is possible to easily hold the battery 1 in a stable state. [0187] Note that, description has been given of an example in which the engagement recesses 39 and 39 are formed on both 20 right and left sides of the battery 1. However, for example, in addition to the engagement recesses 39 and 39 on both the right and left sides, an engagement recess 39 that is opened to at least one of the top surface 11 or the bottom surface 12 may be formed (refer to Fig. 41). 25 [0188] As described above, when the engagement recess 39 opened to the top surface 11 or the bottom surface 12, which is perpendicular to both right and left surfaces facing directions opposite to each other, is formed, it is possible to hold the 30 battery 1 by causing engagement protrusions 98a, 98a, and 98a to respectively engage with the engagement recesses 39, 39, SP368019WO00 65 and 39 from sides opposite to each other and a side perpendicular to the sides opposite to each other, and thus it is possible to hold the battery 1 in a more stable state. [0189] 5 In addition, each of the engagement recesses 39 is formed in a region in which each of the second guided grooves 23 exists, and thus each of the engagement protrusions 98a is guided to the second guided groove 23 and engages with the engagement recess 39. Accordingly, it is possible to easily and reliably 10 perform engagement of the engagement protrusion 98a with the engagement recess 39. [0190] Note that, the engagement recess 39 may be formed in a region in which each of the first guided grooves 22 exists 15 instead of the region in which the second guided groove 23 exists (refer to Fig. 42). In addition, the engagement recess 39 may be formed in a region in which each of the third guided grooves 24 exists (refer to Fig. 43). [0191] 20 Particularly, in a case where the engagement recess 39 is formed in the region in which the first guided groove 22 exists, the engagement recess 39 exists in a region in which the first guided groove 22 located on the most tip end side in the connection direction exists. 25 [0192] Accordingly, when the battery 1 is mounted to the charger 80B, it is not necessary for the engagement protrusion 98a to climb over the groove formed surface 19, and thus it is possible to easily and quickly perform engagement of the 30 engagement protrusion 98a with the engagement recess 39. [0193] SP368019WO00 66 In addition, when the engagement protrusion 98a engages with the engagement recess 39, the electrode terminals of the terminal connection portion 99 are connected to the connection terminals 35 of the connector 33. 5 [0194] Accordingly, engagement of the engagement protrusion 98a with the engagement recess 39, and connection of the electrode terminals to the connection terminals 35 are simultaneously performed, and thus it is not necessary to 10 perform engagement working of the engagement protrusion 98a with the engagement recess 39, and connection working of the electrode terminals to the connection terminals 35 with caution. As a result, it is possible to realize improvement in workability. 15 [0195] Note that, the engagement recess 39 may be formed in a region other than the region in which the first guided groove 22, the second guided groove 23, or the third guided groove 24 exists, or may be formed in a state of being opened to the 20 groove formed surface 19. For example, engagement recesses 39 and 39, which are opened at least to the downward side and the rearward side, may be respectively formed in lower ends at rear ends of the groove formed surfaces 19 and 19 (refer to Fig. 44). 25 [0196] According to the configuration in which the engagement recesses 39 and 39 are respectively formed in the lower ends at the rear ends of the groove formed surfaces 19 and 19, for example, two engagement maintaining portions 92 and 92 are 30 provided in the charger 80 or the like, and the locking protrusions 92a and 92a of the engagement maintaining portions SP368019WO00 67 92 and 92 are respectively locked to opening edges of the engagement recesses 39 and 39, and thus it is possible to hold the battery 1 to the charger 80 or the like. [0197] 5 In this case, the engagement recesses 39 and 39 are located on a further front side in comparison to the rear surface 15 in the battery 1, and thus the locking protrusions 92a and 92a are also located on the front side in proportion to the location on the front side. As a result, the length of the 10 charger 80 or the like in the front and rear direction is shortened, and thus it is possible to realize a reduction in size of the charger 80 or the like. [0198] 15 Next, a configuration of the identification groove 30 or the like will be described (refer to Fig. 45 to Fig. 56). [0199] As described above, the identification groove 30 includes the first identification portion 31 and the second 20 identification portion 32 which have lengths different from each other in the front and rear direction, and the first identification portion 31 and the second identification portion 32 are continuously formed in the right and left direction (refer to Fig. 45 and an upper stage of Fig. 46). 25 The first identification portion 31 and the second identification portion 32 each have identification ability. [0200] On the other hand, in a battery in the related art, a first identification groove A corresponding to the first 30 identification portion 31 and a second identification groove B corresponding to the second identification portion 32 are SP368019WO00 68 formed in a state of being spaced apart from each other with a constant interval in the right and left direction (refer to a lower stage of Fig. 46). [0201] 5 Typically, a width of an identification groove in the right and left direction is determined in accordance with resin flowability, a grade of frame retardance, and the like during molding of a housing. [0202] 10 In addition, the width of the identification groove is formed in a size with which the strength of an identification protrusion that is inserted into the identification groove is secured. Specifically, if the width of the identification groove is small, it is necessary to reduce the width of the 15 identification protrusion to be inserted. However, when the width of the identification protrusion is small, the strength of the identification protrusion decreases, and thus there is a high possibility that breakage or cracks may occur. Accordingly, it is necessary to set the width to a certain 20 extent or greater to secure the strength of the identification protrusion to a certain extent or greater, and thus it is necessary to set the width of the identification groove to a certain extent or greater in proportion to the increase in the width of the identification protrusion. 25 [0203] On the other hand, for example, a horizontal width of the mounting recess 83a in the charger 80 is set to be greater than a horizontal width of the battery 1 by a margin (rattling margin) for securing smooth insertion properties of the battery 30 1 with respect to the mounting recess 83a. Accordingly, dimensions with a margin for allowing insertion of the SP368019WO00 69 identification protrusion to be reliably performed are also necessary for the width of the identification groove. In addition, the width of the identification groove is set to a size in consideration of a dimension tolerance or an 5 assembling tolerance of respective portions, and the width of the identification groove is determined in consideration of the margins. [0204] In addition, in the battery in the related art, a constant 10 interval H is formed between the first identification groove A and the second identification groove B, and it is also necessary for the interval H to have a constant width or greater to secure constant strength or greater. [0205] 15 Accordingly, in a battery of the related art, when the widths of the identification protrusions which are respectively inserted into the first identification groove A and the second identification groove B are set to W1, the width of the first identification groove A and the width of 20 the second identification groove B become "W1 + C" when the margins (the rattling margin + the tolerance margin) is set as C. In addition, the interval H is necessary between the first identification groove A and the second identification groove B, and thus a dimension Wp, which is necessary for the 25 housing to form the first identification groove A and the second identification groove B, in the right and left direction is set as "2W1 + 2C + H". [0206] On the other hand, in the battery 1, the first 30 identification portion 31 corresponding to the first identification groove A and the second identification portion SP368019WO00 70 32 corresponding to the second identification groove B are continuously formed in the right and left direction (refer to an upper stage of Fig. 46). Accordingly, the identification groove 30 including the first identification portion 31 and 5 the second identification portion 32 is formed, and thus the dimension W, which is necessary for the housing 2, in the right and left direction becomes a dimension of "2W1 + 2C" or less because the interval H is not necessary. [0207] 10 In addition, in the identification groove 30, since the first identification portion 31 and the second identification portion 32 are continuously formed in the right and left direction, one margin C between the margins 2C is also unnecessary for the dimension W, and thus the dimension W 15 becomes a dimension of "2W1 + C" or less. [0208] In addition, a part of an identification protrusion, which is inserted into the second identification portion 32 on a short length side, may be inserted into the first 20 identification portion 31, and thus the width of the second identification portion 32 can be set to be smaller than W1. , theWhen a dimension capable of being reduced is set as + C".dimension W becomes "2W1 - [0209] 25 Accordingly, the dimension W, which is necessary for the housing 2 to form the identification groove 30, in the " from theright and left direction decreases by "C + H + dimension Wp, which is necessary for the housing in the battery of the related art, in the right and left direction. As a 30 result, it is possible to reduce the size of the battery 1 by the decrease. SP368019WO00 71 [0210] Note that, description has been given of the identification groove 30 including the first identification portion 31 and the second identification portion 32 which have 5 a rectangular shape as an example. However, in the identification groove 30, for example, the depth bottom surfaces 31a and 32a may be formed in an inclined shape (refer to Fig. 47). In the identification groove 30 in which the depth bottom surfaces 31a and 32a have the inclined shape, 10 one portion in the right and left direction is set as the first identification portion 31, and the other portion is set as the second identification portion 32. [0211] A step difference does not exist in the identification 15 groove 30 in which the depth bottom surfaces 31a and 32a have the inclined shape, and thus it is possible to easily form the identification groove 30 in the housing 2. [0212] Next, an example of batteries 1A and 1B which have an 20 identification groove different from that of the battery 1 will be described (refer to Fig. 48 and Fig. 49). [0213] As described above, two identification grooves 30 and 30 are formed in the battery 1 in a state of being laterally 25 spaced apart from each other. For example, the battery 1 pertains to an intermediate capacity type in which the maximum charging capacity is standard. [0214] For example, the battery 1A pertains to a high-capacity 30 type in which the maximum charging capacity is greater than that of the battery 1. In the battery 1A, one identification SP368019WO00 72 groove 30 and one identification groove 30A are formed (refer to Fig. 48). The identification groove 30A includes a first identification portion 31A of which a length in the front and rear direction is longer than that of a first identification 5 portion 31 and a second identification portion 32A. [0215] For example, the battery 1B pertains to a low-capacity type in which the maximum charging capacity is less than that of the battery 1. In the battery 1B, one identification groove 10 30 is formed (refer to Fig. 49). [0216] Next, description will be given of a configuration example of a battery mounting portion of a connection device to which the battery 1, the battery 1A, or the battery 1B is 15 mounted (refer to Fig. 50 to Fig. 53). [0217] Examples of the connection device include a small-power camera capable of operating at small power, an intermediate-power camera capable of operating at 20 intermediate power greater than that of the small-power camera, and a large-power camera capable of operating at large power greater than that of the intermediate-power camera, and the charger 80. [0218] 25 The terminal connection portion 59 is disposed in a battery mounting portion of the small-power camera, and the identification protrusion that is inserted into the identification groove 30 or the like is not provided (refer to Fig. 50). 30 [0219] The terminal connection portion 59 is disposed in a SP368019WO00 73 battery mounting portion of the intermediate-power camera, and an identification protrusion 90B is provided on the sideward side of the terminal connection portion 59 (refer to Fig. 51). The identification protrusion 90B is set to a 5 length capable of being totally inserted into the first identification portion 31 or the first identification portion 31A. [0220] The terminal connection portion 59 is disposed in a 10 battery mounting portion of the large-power camera, and an identification protrusion 90C is provided on the sideward side of the terminal connection portion 59 (refer to Fig. 52). The identification protrusion 90C is set to a length which is longer than that of the identification protrusion 90B, and with which 15 the entirety of the identification protrusion 90C is not totally inserted into the first identification portion 31, and is capable of being totally inserted into the first identification portion 31A. [0221] 20 As described above, the terminal connection portion 93 is disposed in the battery mounting portion 83 of the charger 80, and the identification protrusion 90 is provided on the sideward side of the terminal connection portion 93 (refer to Fig. 53). The identification protrusion 90 includes the 25 long portion 90a and the short portion 90b. [0222] Next, an example related to an identification property of the above-described identification grooves 30 and 30A will be described (refer to Fig. 54). 30 [0223] Hereinafter, as an example, identification properties SP368019WO00 74 of the battery 1, the battery 1A, and the battery 1B with respect to the small-power camera, the intermediate-power camera, the large-power camera, and the charger 80 will be described. In Fig. 54, "Y" represents that a battery is capable of mounting 5 in a camera or a charger, and "N" represents that the battery is not capable of being mounted in the camera or the charger. [0224] The large-capacity type battery 1A includes the identification groove 30 that is located on the left side and 10 the identification groove 30A that is located on the right side, the intermediate-capacity type battery 1 includes the identification grooves 30 and 30 which are laterally spaced apart from each other, and the small-capacity type battery 1B includes one piece of the identification groove 30 that 15 is located on the left side. [0225] The small-power camera does not include an identification protrusion in the battery mounting portion, and thus a portion that is inserted into the identification 20 groove 30 or 30A does not exist. Accordingly, any of the battery 1, the battery 1A, and the battery 1B can be mounted in the battery mounting portion of the small-power camera, and it is identified that any of the battery 1, the battery 1A, and the battery 1B is a battery capable of being used in 25 the small-power camera. [0226] The intermediate-power camera includes the identification protrusion 90B that is located on the right side of the battery mounting portion, and the identification 30 protrusion 90B is set to be inserted into any of the first identification portion 31 of the identification groove 30 and SP368019WO00 75 the first identification portion 31A of the identification groove 30A. The identification protrusion 90B is inserted into the first identification portion 31 of the identification groove 30 that is located on the right side in the battery 5 1, and the first identification portion 31A of the identification groove 30A that is located on the right side in the battery 1A. On the other hand, since an identification groove is not formed on the right side of the battery 1B, and thus the identification protrusion 90C interferes with the 10 battery 1B. [0227] Accordingly, it is identified that any of the battery 1A and the battery 1 can be mounted in the battery mounting portion of the intermediate-power camera, but the battery 1B 15 cannot be mounted in the battery mounting portion, and any of the battery 1A and the battery 1 is a battery capable of being used in the intermediate-power camera, and it is identified that the battery 1B is a battery that is not capable of being used in the intermediate-power camera. 20 [0228] The large-power camera includes the identification protrusion 90C that is located on the right side of the battery mounting portion, and the identification protrusion 90C is set to be inserted into the first identification portion 31A 25 of the identification groove 30A. The identification protrusion 90C is inserted into the first identification portion 31A of the identification groove 30A that is located on the right side in the battery 1A. On the other hand, the identification protrusion 90C can be inserted into the first 30 identification portion 31 of the identification groove 30 that is located on the right side in the battery 1, but is inserted SP368019WO00 76 partway into the identification portion 31, and thus the electrode terminals 95 are not connected to the connection terminals 35 of the connector 33 of the battery 1. In addition, since an identification groove is not provided on the right 5 side of the battery 1B, the identification protrusion 90C interferes with the battery 1B. [0229] Accordingly, it is identified that the battery 1A can be mounted in the battery mounting portion of the large-power 10 camera, but the battery 1 and the battery 1B cannot be mounted in the battery mounting portion, the battery 1A is a battery capable of being used in the large-power camera, and the battery 1 and the battery 1B are batteries which are not capable of being used in the large-power camera. 15 [0230] The charger 80 includes the identification protrusion 90 that is located on the left side of the battery mounting portion 83, and the identification protrusion 90 is set to be inserted into the identification groove 30. The 20 identification protrusion 90 is inserted into the identification groove 30 that is located on the left side of any of the battery 1, the battery 1A, and the battery 1B. [0231] Accordingly, it is identified that any of the battery 25 1, the battery 1A, and the battery 1B can be mounted to the battery mounting portion 83 of the charger 80, and any of the battery 1, the battery 1A, and the battery 1B is a battery capable of being used in the charger 80. [0232] 30 Note that, description has been given of an example related to identification of batteries in accordance with a SP368019WO00 77 difference in charging capacity. However, identification with the identification groove 30 or the like is not limited to identification in accordance with a difference in charging capacity, and is also applicable to, for example, 5 identification related to other differences such as a difference as to whether or not a battery is a chargeable type, and a difference in a charging speed. [0233] In addition, description has been given of an example 10 of the identification groove 30 that is constituted by two parts including the first identification portion 31 and the second identification portion 32 which have lengths different from each other, but the identification groove 30 may include three or more identification portions which have lengths 15 different from each other. [0234] As described above, the identification groove 30 for performing identification of a connection device is formed in the housing 2 of the battery 1 (the battery 1A or the battery 20 1B), and in the identification groove 30, a plurality of identification portions having lengths different from each other is continuously formed. [0235] Accordingly, since a portion that isolates the 25 identification portions does not exist between the plurality of identification portions having lengths different from each other, a size in a direction in which the identification portions of the identification groove 30 are continuous becomes a total size of the plurality of identification portions, and 30 it is possible to realize a reduction in size of the battery 1 while securing high identification property. SP368019WO00 78 [0236] In addition, since the first identification portion 31 and the second identification portion 32 are formed as identification portions, a size in a direction in which the 5 identification portions of the identification groove 30 are continuous becomes a total size of the first identification portion 31 and the second identification portion 32, and thus it is possible to realize a reduction in size of the battery 1 while improving the identification property. 10 [0237] In addition, in the identification groove 30, a plurality of identification portions is continuously formed in a width direction, a size of the identification groove 30 in the width direction becomes a total size of the plurality of 15 identification portions, and it is possible to realize a reduction in size of the battery 1 in the width direction while improving the identification property in comparison to a case where a plurality of identification grooves is formed to be spaced apart from each other in the width direction. 20 [0238] In addition, in the plurality of identification portions, the shorter a length is, the smaller a width is. For example, in the first identification portion 31 and the second identification portion 32, a width of the second identification 25 portion 32 having a short length is set to be smaller than a width of the first identification portion 31 having a long length. [0239] Accordingly, the size of the identification groove 30 30 in a width direction becomes smaller than a total width in a case where identification portions having the same width SP368019WO00 79 are formed, and thus it is possible to realize a further reduction in size of the battery 1 in the width direction while improving the identification property. [0240] 5 In addition, since the two identification grooves 30 and 30 are formed in a state of being spaced apart from each other in the width direction, it is possible to perform identification of a connection device by using the two identification grooves 30 and 30, and it is possible to increase 10 the kind of connection devices capable of being identified. [0241] Note that, in this case, shapes or sizes of the two identification grooves 30 and 30 can be set to be different from each other. 15 [0242] In addition, in each of the identification grooves 30, the first identification portion 31 and the second identification portion 32 may be formed in shapes different from each other (refer to Fig. 55). For example, in the 20 identification groove 30, the second identification portion 32 may be formed in a space having an approximately triangular column shape, and when the identification groove 30 is formed in this shape, a portion of a region of the second identification portion 32 in the inner bottom surface 30a of the identification 25 groove 30 is formed as an inclined surface 32c. The inclined surface 32c is inclined to be displaced toward the bottom surface 12 side as it approaches the lateral surface 13 that is located on a side opposite to the first identification portion 31 that is continuous to the second identification 30 portion 32 in the right and left direction. [0243] SP368019WO00 80 The identification groove 30 is a portion that is formed in the vicinity of the first guided groove 22, and when the identification groove 30 is formed in this shape, the thickness (width) of a portion between the first guided groove 22 and 5 the identification groove 30 in the housing 2 increases, and thus it is possible to reinforce a portion at the periphery of the first guided groove 22. [0244] In addition, description has been given of the 10 identification groove 30 in which the first identification portion 31X and the second identification portion 32X having lengths different from each other are continuous in the width direction as an example, but an identification groove 30X may be formed instead of the identification groove 30 (refer to 15 Fig. 56). The identification groove 30X has a configuration in which a first identification portion 31X and a second identification portion 32X which have sizes different from each other in the upper and lower direction (depth direction) are continuous. For example, the first identification 20 portion 31X is set to be longer than the second identification portion 32X, and the first identification portion 31X is continuously formed on a lower side of the second identification portion 32X. [0245] 25 Note that, as in the identification groove 30, the identification groove 30X may include three or more identification portions having lengths different from each other. [0246] 30 As described above, when a plurality of identification portions is continuously formed in the depth direction, a size SP368019WO00 81 of the identification groove 30X in the depth direction becomes a total size of the plurality of identification portions, and it is possible to realize a reduction in size of the battery 1 in the depth direction (upper and lower direction) while 5 improving the identification property in comparison to a case where the plurality of identification grooves is formed to be spaced apart from each other in the depth direction. [0247] In addition, in the identification groove 30X, as a 10 length is shorter, depths of the plurality of identification portions may be set to be smaller. [0248] When the identification groove 30X is set to the above-described configuration, the size of the identification 15 groove 30X in the depth direction becomes smaller than a total depth in a case where identification portions having the same depth are formed, and thus it is possible to realize a further reduction in size of the battery 1 in the depth direction while improving the identification property. 20 [0249] Hereinafter, modification examples of respective portions of the battery 1 will be described (refer to Fig. 57 to Fig. 59). 25 [0250] A first modification example relates to a modification example of the recess formed surface (refer to Fig. 57 and Fig. 58). A recess formed surface 29A according to the first modification example includes wall portions 29d and 29d. The 30 wall portions 29d and 29d respectively include first inclined surfaces 40 and 40 which are continuous to the base portion SP368019WO00 82 29a, intermediate surfaces 41 and 41 which are continuous to the first inclined surfaces 40 and 40, and second inclined surfaces 42 and 42 which are continuous to the intermediate surfaces 41 and 41. 5 [0251] The first inclined surfaces 40 and 40 are continuous to a front end of the base portion 29a, and are inclined in a direction of being spaced apart from each other in the right and left direction as they go toward the front side. The 10 intermediate surfaces 41 and 41 are continuous to front ends of the first inclined surfaces 40 and 40, and are formed as surfaces facing the front side. The second inclined surfaces 42 and 42 are continuous to outer edges of the intermediate surfaces 41 and 41 in the right and left direction, and are 15 inclined in a direction of being spaced apart from each other in the right and left direction as they go toward the front side. [0252] An inclination angle of each of the first inclined 20 surfaces 40 with respect to the intermediate surface 41 is set to be greater than an inclination angle of each of the second inclined surfaces 42 with respect to the intermediate surface 41. However, the inclination angle of the first inclined surface 40 with respect to the intermediate surface 25 41 may be set to be smaller than the inclination angle of the second inclined surface 42 with respect to the intermediate surface 41, or may be set to be the same as the inclination angle of the second inclined surface 42 with respect to the intermediate surface 41. 30 [0253] In addition, a width of the first inclined surface 40 SP368019WO00 83 in an inclined direction thereof is set to be greater than a width of the second inclined surface 42 in an inclined direction thereof. However, the width of the first inclined surface 40 in the inclined direction thereof may be set to 5 be smaller than the width of the second inclined surface 42 in the inclined direction thereof, or may be set to be the same as the width of the second inclined surface 42 in the inclined direction thereof. [0254] 10 When the recess formed surface 29A including the wall portions 29d and 29d is formed, the thickness of a portion on a rear side of each of the wall portions 29d and 29d in the housing 2 in the front and rear direction increases, and thus it is possible to realize improvement of the strength 15 of the housing 2. [0255] A second modification example relates to a modification example of the connector (refer to Fig. 59). A connector 33A according to the second modification example includes the 20 housing 34 formed from a non-conductive material, and the connection terminals 35, 35, and 35 formed from a conductive material. The terminal disposition grooves 36, 36, and 36 in which the connection terminals 35, 35, and 35 are disposed are formed in the housing 34, but the positioning grooves 37 25 and 37 are not formed. [0256] The connection terminals 35, 35, and 35 which function as a positive electrode terminal, a negative electrode terminal, and an information terminal are respectively disposed in the 30 terminal disposition grooves 36, 36, and 36. Note that, in the connector 33A, two terminal disposition grooves 36 and SP368019WO00 84 may be36, or four terminal disposition grooves 36, 36, formed. In a case where the two terminal disposition grooves 36 and 36 are formed in the connector 33A, a positive electrode terminal and a negative electrode terminal are respectively 5 disposed in the two terminal disposition grooves 36 and 36. In a case where the four terminal disposition grooves 36, 36, are formed in the connector 33A, a positive electrode terminal, a negative electrode terminal, an information terminal, and a communication terminal are respectively .10 disposed in the four terminal disposition grooves 36, 36, [0257] In a case where the connector 33A can be used, the positioning grooves 37 and 37 are formed on both right and left sides of the connector 33A in the housing 2. 15 [0258] When the above-described connector 33A can be used, in the housing 2, a width of a portion on both sides of the disposition recess 27 in the right and left direction increases, and it is possible to realize improvement of the strength of 20 the housing 2. [0259] Next, a configuration of a battery 1C different from the battery 1 will be described (refer to Fig. 60 and Fig. 25 61). [0260] Note that, the following battery 1C is different from the above-described battery 1 in that the connector does not exist, and configurations of respective portions other than 30 the connector, positional relationships of the respective portions, or sizes thereof are similar as in the battery 1. SP368019WO00 85 Accordingly, only portions different from those in the battery 1 will be described in detail, and with regard to the other portions, the same reference numerals will be given to similar portions as in the battery 1, description thereof will be 5 omitted. [0261] A recess 27C is formed at the front end of the bottom portion 21 (refer to Fig. 60). The recess 27C is formed at approximately the central portion in the right and left 10 direction, and is opened to the forward side and the downward side. [0262] The recess 27C is formed by a recess formed surface 29C. The recess formed surface 29C includes a base portion 29e, 15 wall portions 29b and 29b, and an intermediate portion 29c. [0263] The base portion 29e is in a state of facing the forward side. The wall portions 29b and 29b are respectively continuous to both right and left ends of the base portion 20 29e, and are formed as inclined surfaces which are spaced apart from each other in the right and left direction as they go toward the front side. The intermediate portion 29c is formed between lower edges of the wall portions 29b and 29b which face the downward side. 25 [0264] Terminal disposition grooves 36C, 36C, and 36C are formed in a portion that is continuous to a rear side of the recess 27C in the housing 2C in a state of being laterally spaced apart from each other. Each of the terminal disposition 30 grooves 36C is opened to the downward side and the forward side, and an opening on the front side is formed in the base SP368019WO00 86 portion 29e. Connection terminals 35, 35, and 35 are held to the housing 2C in a state in which at least parts thereof are respectively disposed in the terminal disposition grooves 36C, 36C, and 36C. In the battery 1C, a connector is not 5 provided, and the connection terminals 35, 35, and 35 are constructed as a terminal portion. [0265] Positioning grooves 37C and 37C, which are respectively opened to the forward side and the downward side, are formed 10 in the housing 2C on outer sides of the terminal disposition grooves 36C, 36C, and 36C. [0266] Portions between the terminal disposition grooves 36C, 36C, and 36C in the housing 2C are provided as terminal isolation 15 ribs 2b and 2b, and portions between the terminal disposition grooves 36C and 36C and the positioning grooves 37C and 37C in the housing 2C are provided as intergroove ribs 2c and 2c. A width of each of the terminal isolation rib 2b in the right and left direction is set to be greater than a width of each 20 of the intergroove ribs 2c in the right and left direction to prevent contact between the connection terminals 35, 35, and 35. [0267] Note that, description has been given of an example in 25 which the positioning grooves 37C and 37C are formed at a position that is continuous to the recess 27C, but the positioning grooves 37C and 37C may be respectively formed on both the right and left sides of the recess 27C in the housing 2C (refer to Fig. 61). 30 [0268] In addition, in the battery 1C, two terminal disposition SP368019WO00 87 grooves 36C and 36C, or four terminal disposition grooves 36C, may be formed as in the battery 1.36C, [0269] As described above, in the battery 1C, since the 5 connector is not provided, and the terminal disposition grooves 36C and the positioning grooves 37C are formed in the housing 2C, it is possible to realize a reduction in the manufacturing cost due to simplification of a structure and a reduction in the number of parts. 10 [0270] The present technology can employ the following configurations. [0271] 15 (1) A battery including: a housing of which an outer surface includes a plurality of exterior surfaces in directions different from each other, and in which a disposition recess is formed; 20 a cell that is accommodated on an inner side of the housing; and a connector that includes a connection terminal that is connected to an electrode terminal of a connection device, and is disposed in the disposition recess, in which 25 a surface that forms the disposition recess of the housing is formed as a recess formed surface, and the recess formed surface exists between the exterior surfaces and the connector. [0272] 30 (2) The battery according to (1), in which SP368019WO00 88 the disposition recess is opened at least in a connection direction between the connection terminal and the electrode terminal, and the recess formed surface exists between the exterior 5 surfaces and the connector in the connection direction. [0273] (3) The battery according to (1), in which the disposition recess is opened to two directions which 10 are perpendicular to each other, and the recess formed surface exists respectively between the exterior surfaces and the connector in the two directions. [0274] (4) 15 The battery according to (2) or (3), in which a part of the recess formed surface is formed as an inclined surface in which an opening area of the disposition recess increases as the inclined surface is spaced apart from the connector in an opening direction of the disposition 20 recess. [0275] (5) The battery according to (4), in which the recess formed surface includes a pair of wall 25 portions which is located to be spaced apart from each other in a direction that is perpendicular to the connection direction, and the pair of wall portions is formed as inclined surfaces which are spaced apart from each other as the wall portions 30 are spaced apart from the connector in the connection direction. SP368019WO00 89 [0276] (6) The battery according to (5), in which the recess formed surface includes an intermediate 5 portion between the pair of wall portions, and the intermediate portion is formed as an inclined surface in which the opening area of the disposition recess increases as the intermediate portion is spaced apart from the connector in the connection direction. 10 [0277] (7) The battery according to any one of (4) to (6), in which an inclination angle of the recess formed surface with respect to the connection direction is set to be greater than . and equal to or less than 4515 0 [0278] (8) A connection device to which a battery is detachably mounted, the battery including a housing of which an outer 20 surface includes a plurality of exterior surfaces in directions different from each other, and in which a disposition recess is formed, a cell that is accommodated on an inner side of the housing, and a connector that includes a connection terminal that is connected to an electrode terminal of, and 25 is disposed in the disposition recess, in which in the battery, a surface that forms the disposition recess of the housing is formed as a recess formed surface, and the recess formed surface exists between the exterior surfaces and the connector. 30 [0279] (9) SP368019WO00 90 A battery including: a housing that includes a front side portion and a rear side portion which are disposed in a longitudinal direction, a right side portion and a left side portion which are disposed 5 between the front side portion and the rear side portion in a width direction that is perpendicular to the longitudinal direction, a top side portion and a bottom side portion which are disposed between the front side portion and the rear side portion, and the right side portion and the left side portion 10 in a height direction that is perpendicular to the longitudinal direction and the width direction; a cell that is accommodated on an inner side of the housing; and connection terminals which are disposed in a terminal 15 disposition groove formed on a front end side of the housing, and include a positive electrode terminal and a negative electrode terminal which are connected to electrode terminals of a connection device, in which a front end of at least one of the positive electrode 20 terminal or the negative electrode terminal is located on a further rear side in comparison to a front end of the front side portion. [0280] (10) 25 The battery according to (9), in which a recess, in which at least parts of the electrode terminals are disposed in a state in which the positive electrode terminal and the negative electrode terminal are connected to the electrode terminals, and which is continuous 30 to the terminal disposition groove, is formed in the housing, a part of the recess is opened at least in a connection SP368019WO00 91 direction between the connection terminals and the electrode terminals, and a recess formed surface, which is a surface that forms the recess, exists between the outer surface of the housing 5 and the terminal disposition groove in the connection direction. [0281] (11) A battery according to (9), in which 10 a recess, in which at least parts of the electrode terminals are disposed in a state in which the positive electrode terminal and the negative electrode terminal are connected to the electrode terminals, and which is continuous to the terminal disposition groove, is formed in the housing, 15 the recess is opened in two directions perpendicular to each other, and a recess formed surface, which is a surface that forms the recess, exists respectively between the outer surface of the housing and the terminal disposition groove in the two 20 directions. [0282] (12) The battery according to (10) or (11), in which a part of the recess formed surface is formed as an 25 inclined surface in which an opening area of the recess increases as the inclined surface is spaced apart from the terminal disposition groove in an opening direction of the recess. [0283] 30 (13) The battery according to (12), in which SP368019WO00 92 the recess formed surface includes a pair of wall portions which is located to be spaced apart from each other in a direction that is perpendicular to the connection direction, and 5 the pair of wall portions is formed as inclined surfaces which are spaced apart from each other as the wall portions are spaced apart from the terminal disposition groove in the connection direction. [0284] 10 (14) The battery according to (13), in which the recess formed surface includes an intermediate portion between the pair of wall portions, and the intermediate portion is formed as an inclined surface 15 in which the opening area of the recess increases as the intermediate portion is spaced apart from the terminal disposition groove in the connection direction. [0285] (15) 20 The battery according to any one of (12) to (14), in which an inclination angle of the recess formed surface with respect to the connection direction is set to be greater than . and equal to or less than 450 25 [0286] (16) A connection device to which a battery is detachably mounted, the battery including a housing that includes a front side portion and a rear side portion which are disposed in 30 a longitudinal direction, a right side portion and a left side portion which are disposed between the front side portion and SP368019WO00 93 the rear side portion in a width direction that is perpendicular to the longitudinal direction, a top side portion and a bottom side portion which are disposed between the front side portion and the rear side portion, and the right side portion and the 5 left side portion in a height direction that is perpendicular to the longitudinal direction and the width direction, a cell that is accommodated on an inner side of the housing, and a positive electrode terminal and a negative electrode terminal which are disposed in a terminal disposition groove formed 10 on a front end side of the housing, and are connected to electrode terminals, in which in the battery, a front end of at least one of the positive electrode terminal or the negative electrode terminal is located on a further rear side in comparison to a front end 15 of the front side portion. REFERENCE SIGNS LIST [0287] 1 Battery 20 2 Housing 6 Cell 10 Outer surface 17 Exterior surface 27 Disposition recess 25 29 Recess formed surface 29b Wall portion 29c Intermediate portion 33 Connector 35 Connection terminal 30 36 Terminal disposition groove 50 Imaging device (connection device) SP368019WO00 94 61 Electrode terminal 80 Charger (connection device) 95 Electrode terminal 80A Charger (connection device) 5 80B Charger (connection device) 1A Battery 1B Battery 29X Recess formed surface 29d Wall portion 10 33A Connector 1C Battery 2C Housing 27C Recess 29C Recess formed surface 15 36C Terminal disposition groove 37C Positioning groove SP368019WO00 95 WE CLAIM 1. A battery comprising: a housing of which an outer surface includes a plurality 5 of exterior surfaces in directions different from each other, and in which a disposition recess is formed; a cell that is accommodated on an inner side of the housing; and a connector that includes a connection terminal that 10 is connected to an electrode terminal of a connection device, and is disposed in the disposition recess, wherein a surface that forms the disposition recess of the housing is formed as a recess formed surface, and the recess formed surface exists between the exterior 15 surfaces and the connector. 2. The battery according to claim 1, wherein the disposition recess is opened at least in a connection direction between the connection terminal and the electrode 20 terminal, and the recess formed surface exists between the exterior surfaces and the connector in the connection direction. 3. The battery according to claim 1, wherein 25 the disposition recess is opened to two directions which are perpendicular to each other, and the recess formed surface exists respectively between the exterior surfaces and the connector in the two directions. 30 4. The battery according to claim 2, wherein a part of the recess formed surface is formed as an SP368019WO00 96 inclined surface in which an opening area of the disposition recess increases as the inclined surface is spaced apart from the connector in an opening direction of the disposition recess. 5 5. The battery according to claim 4, wherein the recess formed surface includes a pair of wall portions which is located to be spaced apart from each other in a direction that is perpendicular to the connection 10 direction, and the pair of wall portions is formed as inclined surfaces which are spaced apart from each other as the wall portions are spaced apart from the connector in the connection direction. 15 6. The battery according to claim 5, wherein the recess formed surface includes an intermediate portion between the pair of wall portions, and the intermediate portion is formed as an inclined surface 20 in which the opening area of the disposition recess increases as the intermediate portion is spaced apart from the connector in the connection direction. 7. The battery according to claim 4, wherein 25 an inclination angle of the recess formed surface with respect to the connection direction is set to be greater than . and equal to or less than 450 8. A connection device to which a battery is detachably 30 mounted, the battery including a housing of which an outer surface includes a plurality of exterior surfaces in directions SP368019WO00 97 different from each other, and in which a disposition recess is formed, a cell that is accommodated on an inner side of the housing, and a connector that includes a connection terminal that is connected to an electrode terminal, and is 5 disposed in the disposition recess, wherein in the battery, a surface that forms the disposition recess of the housing is formed as a recess formed surface, and the recess formed surface exists between the exterior surfaces and the connector. 10 9. A battery comprising: a housing that includes a front side portion and a rear side portion which are disposed in a longitudinal direction, a right side portion and a left side portion which are disposed 15 between the front side portion and the rear side portion in a width direction that is perpendicular to the longitudinal direction, a top side portion and a bottom side portion which are disposed between the front side portion and the rear side portion, and the right side portion and the left side portion 20 in a height direction that is perpendicular to the longitudinal direction and the width direction; a cell that is accommodated on an inner side of the housing; and connection terminals which are disposed in a terminal 25 disposition groove formed on a front end side of the housing, and include a positive electrode terminal and a negative electrode terminal which are connected to electrode terminals of a connection device, wherein a front end of at least one of the positive electrode 30 terminal or the negative electrode terminal is located on a further rear side in comparison to a front end of the front SP368019WO00 98 side portion. 10. The battery according to claim 9, wherein a recess, in which at least parts of the electrode 5 terminals are disposed in a state in which the positive electrode terminal and the negative electrode terminal are connected to the electrode terminals, and which is continuous to the terminal disposition groove, is formed in the housing, a part of the recess is opened at least in a connection 10 direction between the connection terminals and the electrode terminals, and a recess formed surface, which is a surface that forms the recess, exists between the outer surface of the housing and the terminal disposition groove in the connection 15 direction. 11. The battery according to claim 9, wherein a recess, in which at least parts of the electrode terminals are disposed in a state in which the positive 20 electrode terminal and the negative electrode terminal are connected to the electrode terminals, and which is continuous to the terminal disposition groove, is formed in the housing, the recess is opened in two directions perpendicular to each other, and 25 a recess formed surface, which is a surface that forms the recess, exists respectively between the outer surface of the housing and the terminal disposition groove in the two directions. 30 12. The battery according to claim 10, wherein a part of the recess formed surface is formed as an SP368019WO00 99 inclined surface in which an opening area of the recess increases as the inclined surface is spaced apart from the terminal disposition groove in an opening direction of the recess. 5 13. The battery according to claim 12, wherein the recess formed surface includes a pair of wall portions which is located to be spaced apart from each other in a direction that is perpendicular to the connection 10 direction, and the pair of wall portions is formed as inclined surfaces which are spaced apart from each other as the wall portions are spaced apart from the terminal disposition groove in the connection direction. 15 14. The battery according to claim 13, wherein the recess formed surface includes an intermediate portion between the pair of wall portions, and the intermediate portion is formed as an inclined surface 20 in which the opening area of the recess increases as the intermediate portion is spaced apart from the terminal disposition groove in the connection direction. 15. The battery according to claim 12, wherein 25 an inclination angle of the recess formed surface with respect to the connection direction is set to be greater than . and equal to or less than 450 16. A connection device to which a battery is detachably 30 mounted, the battery including a housing that includes a front side portion and a rear side portion which are disposed in SP368019WO00 100 a longitudinal direction, a right side portion and a left side portion which are disposed between the front side portion and the rear side portion in a width direction that is perpendicular to the longitudinal direction, a top side portion and a bottom 5 side portion which are disposed between the front side portion and the rear side portion, and the right side portion and the left side portion in a height direction that is perpendicular to the longitudinal direction and the width direction, a cell that is accommodated on an inner side of the housing, and a 10 positive electrode terminal and a negative electrode terminal which are disposed in a terminal disposition groove formed on a front end side of the housing, and are connected to electrode terminals, wherein in the battery, a front end of at least one of the positive 15 electrode terminal or the negative electrode terminal is located on a further rear side in comparison to a front end of the front side portion.