FORM 2
THE PATENTS ACT 1970
[39 OF 1970]
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
[See section 10; Rule 13]
TITLE: “METHOD AND SYSTEM FOR OPERATING DUAL BATTERY IN A
VEHICLE”
Name and Address of the Applicant: TATA MOTORS LIMITED,
Bombay House, 24 Homi Mody Street, Hutatma Chowk, Mumbai 400 001, Maharashtra
Nationality: Indian
The following specification particularly describes the invention and the manner in which it is to be performed.

TECHNICAL FIELD
[0001] The present disclosure relates, in general, to battery management in vehicles. Particularly, the present disclosure relates to a method and system for operating dual battery in a vehicle.
BACKGROUND
[0002] An alternator is an electrical generator which is typically a part of a combustion engine in a vehicle. The alternator converts mechanical energy into electrical energy such that a battery and other electrical components of the vehicle is charged. The electrical components are such as but not limited to a suspension system, a light, electronic brakes, and the like. In conventional charging system, the alternator is continuously in operation to charge the battery and may provide electrical power to electrical loads. This might lead to the alternator becoming an additional mechanical load on an engine crankshaft. Due to this continuous operation, the combustion engine may continuously be in loaded condition. Due to this, some part of mechanical power from the combustion engine is always consumed for operating the alternator. The aforementioned condition may lead to additional consumption of fuel. In such a case, a braking condition may be ON, however there may not be any control on an output voltage in some conditions and the batteries in the conventional charging system may not be able to absorb high charging current. Further, in the conventional charging system, once the battery is discharged, a cranking of the vehicle may not be possible in cases the vehicle is idle for a longer duration.
[0003] The information disclosed in this background of the disclosure section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
SUMMARY
[0004] Disclosed herein is a method for operating dual battery in a vehicle. The method comprises determining a State of Charge (SOC) value of a first battery and a second battery based on one or more battery parameters received from one or more sensors of the vehicle. The method further comprises facilitating charging of the second battery for a first predefined time-

period and discharging of the second battery for a second predefined time-period upto a third predefined threshold value when the SOC value of the first battery is greater than a first predefined threshold value and the SOC value of the second battery is greater than a fourth predefined threshold value.
[0005] Further, the present disclosure relates to a controller for operating dual battery in the vehicle. The controller is configured to determine the SOC value of the first battery and the second battery based on the one or more battery parameters received from the one or more sensors of the vehicle. The controller is further configured to facilitate the charging of the second battery for the first predefined time-period and discharging of the second battery for the second predefined time-period upto the third predefined threshold value when the SOC value of the first battery is greater than the first predefined threshold value and the SOC value of the second battery is greater than the fourth predefined threshold value.
[0006] The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
[0007] The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate exemplary embodiments and, together with the description, explain the disclosed principles. In the figures, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. The same numbers are used throughout the figures to reference like features and components. Some embodiments of system and/or methods in accordance with embodiments of the present subject matter are now described, by way of example only, and regarding the accompanying figures, in which:
[0008] FIG. 1 depicts a schematic representation of a vehicle environment for operating dual batteries in the vehicle, in accordance with some embodiments of the present disclosure;
[0009] FIG. 2 depicts a detailed block diagram of a controller for operating dual batteries in a vehicle, in accordance with some embodiments of the present disclosure;

[0010] FIG. 3A depicts a flowchart illustrating a method for operating a dual battery, in accordance with some embodiments of the present disclosure;
[0011] FIG. 3B depicts a flowchart illustrating a method for facilitating charging of a first battery, in accordance with some embodiments of the present disclosure; and
[0012] FIG. 4 depicts a flowchart illustrating an exemplary method of operating a dual battery, in accordance with some embodiments of the present disclosure.
[0013] It should be appreciated by those skilled in the art that any block diagrams herein represent conceptual views of illustrative systems embodying the principles of the present subject matter. Similarly, it will be appreciated that any flow charts, flow diagrams, state transition diagrams, pseudo code, and the like represent various processes which may be substantially represented in computer readable medium and executed by a computer or processor, whether such computer or processor is explicitly shown.
DETAILED DESCRIPTION
[0014] In the present document, the word “exemplary” is used herein to mean “serving as an example, instance, or illustration.” Any embodiment or implementation of the present subject matter described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.
[0015] While the disclosure is susceptible to various modifications and alternative forms, specific embodiment thereof has been shown by way of example in the drawings and will be described in detail below. It should be understood, however that it is not intended to limit the disclosure to the specific forms disclosed, but on the contrary, the disclosure is to cover all modifications, equivalents, and alternative falling within the scope of the disclosure.
[0016] The terms “comprises”, “comprising”, “includes”, or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a setup, device, or method that comprises a list of components or steps does not include only those components or steps but may include other components or steps not expressly listed or inherent to such setup or device or method. In other words, one or more elements in a system or apparatus proceeded by “comprises… a” does not, without more constraints, preclude the existence of other elements or additional elements in the system or method.

[0017] In the following detailed description of the embodiments of the disclosure, reference is made to the accompanying drawings that form a part hereof, and in which are shown by way of illustration specific embodiments in which the disclosure may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the disclosure, and it is to be understood that other embodiments may be utilized and that changes may be made without departing from the scope of the present disclosure. The following description is, therefore, not to be taken in a limiting sense.
[0018] FIG. 1 depicts a schematic representation of a vehicle environment 100 for operating dual batteries in the vehicle, in accordance with some embodiments of the present disclosure.
[0019] The vehicle environment 100 comprises a first battery 101, sensors (102-108), a controller 109, a relay 110, an alternator 111, an instrument cluster 112, a second battery 113, a starter motor 114, electrical loads 115 and the like.
[0020] In an embodiment, the controller 109 determines a State of Charge (SOC) value of the first battery 101 and the second battery 113 based on one or more battery parameters received from one or more sensors of the vehicle. The controller 109 is further configured to determine an engine status and an ignition status of the vehicle using one or more vehicle parameters. The engine status and the ignition status are one of: ON or OFF. Further, when the ignition status is ON and the engine status if OFF, the electrical loads 115 are powered in the vehicle using the second battery 113. The controller 109 determines the SOC value of the first battery 101 and the second battery based on the status of the one or more vehicle parameters. The one or more battery parameters comprises such as but not limited to health of the dual battery, voltage, capacity, power and current. The charging and discharging of the dual battery (the first battery 101 and the second battery 113 referred together) may be facilitated by the controller 109 using the alternator 111.
[0021] In an embodiment, the one or more sensors (102-108). It will be appreciated that the environment shown in FIG. 1 can include n sensors. The sensors 102-108 may be such as but not limited to a crank position sensor, a park brake switch, a vehicle speed sensor, an ignition relay output, a service brake switch, an intelligent battery sensor, a parking light input sensor, respectively. The dotted arrow lines in FIG. 1 indicate data lines. The data lines may carry date between the different components such as between the controller 109 and the instrument cluster 112, between the alternator 111 and the controller 109 and so on. The dotted arrow lines carry

the data using protocols such as but not limited to a Controller Area Network (CAN) protocol, a Local Interconnect Network (LIN) protocol and the like. Further, solid lines in FIG. 1 indicate power lines which carry electrical signals. The solid lines carry the electrical signals using the protocols such as but not limited to Inter Integrated Controller (I2C), Serial Peripheral Interface (SPI), H/W input and the like. The relay 110 includes a first terminal which is connected to output of the alternator 111 and a second terminal which connects the first battery 101 and the second battery 113. In case when the relay 110 is actuated, the alternator 111 is connected to the first battery 101. Further, during default condition, the relay 110 connects the alternator 111 to the second battery 113. One or more electrical loads 115 are connected in parallel to the first battery 101 and the second battery 113. The electrical loads 115 are such as but not limited to a suspension system, a light, brakes, and the like. Further, the starter motor 114 may be cranked through the first battery 101 for switching ON an engine of the vehicle. The controller 109 notifies charging status and discharging status to a user via the instrument cluster 112.
[0022] In an embodiment, the first battery 101 and the second battery 113 may include an inbuilt battery management system respectively. The battery management system may be responsible for monitoring and operating the respective battery. The crank position sensor is utilized to provide the one or more inputs related to an engine RPM. The parking light input sensor is utilized to provide the one or more inputs on day and night condition. For example, during night times, during braking condition a high voltage and high current spike is provided to the battery. This parking light input sensor maybe utilized to distinguish if the high current spike needs to be provided or should the battery charge in a normal mode. The vehicle speed sensor provides one or more inputs on if the vehicle is moving or if the vehicle is not moving. During braking condition, the vehicle speed sensor is cross verified if a vehicle speed is greater than zero and the high voltage spike may be observed by the second battery 113. An ignition relay is utilized to provide one or more inputs based on if the ignition of the vehicle is ON or OFF. The service brake switch is utilized to provide one or more inputs based on the braking condition. The intelligent battery sensor determines one or more inputs with respect to the first battery SOC and may provide other one or more battery parameters such as voltage, current, temperature of the first battery 101 in order to determine health condition of the first battery 101. The park brake switch is an alternative for the service brake switch.

[0023] In an embodiment, the controller 109 is configured to determine the status of the one or more vehicle parameters by determining if the engine Revolutions Per Minute (RPM) is in a normal range. The controller 109 is further configured to determine the one or more vehicle parameters by comparing the SOC value of the first battery 101 with a first predefined threshold value. The controller 109 is further configured to determine the status of the one or more vehicle parameters by determining if the vehicle speed is atleast one of: lesser or greater than predefined range. The controller 109 is further configured to determine the status of the one or more vehicle parameters by determining if a service brake condition is either one of: ON or OFF. The controller 109 is further configured to determine the status of the one or more vehicle parameters by determining if parking light switch is either one of: ON or OFF.
[0024] In an embodiment, the controller 109 is further configured to facilitate the charging of the first battery 101 for a time-period until the SOC value of the first battery 101 reaches a second predefined threshold value, when the SOC value of the first battery 101 is less than the first predefined threshold value. The controller 109 is further configured to compare the SOC value of the second battery 113 with a third predefined threshold value, when the SOC value of the first battery 101 is greater than the first predefined threshold value. The controller 109 is further configured to facilitate charging of the second battery 113 when the SOC value of the second battery is less than the third predefined threshold value. The charging is facilitated until the SOC of the second battery 113 reaches a fourth predefined threshold value.
[0025] The controller 109 is further configured to facilitate charging of the second battery 113 for a first predefined time-period and discharging of the second battery 113 for a second predefined time-period upto the third predefined threshold value, when the SOC value of the first battery 101 is greater than the first predefined threshold value and the SOC value of the second battery 113 is greater than the fourth predefined threshold value. The controller 109 is further configured to switch OFF the alternator 111 in the vehicle for the second predefined time-period and switch ON the alternator 111 for the first predefined time-period, when the second battery 113 is charged upto the fourth predefined threshold value. The second predefined time-period is greater than the first predefined time-period.
[0026] FIG. 2 depicts a detailed block diagram of a controller 109 for operating dual batteries in a vehicle, in accordance with some embodiments of the present disclosure.

[0027] In an embodiment, the controller 109 may include an I/O Interface 201 and a memory 202. The I/O interface 201 may be configured for receiving and transmitting an input signal or/and an output signal related to one or more operations of the controller 109. In an embodiment, the memory 202 may store data 203 and one or more modules 205 of the controller 109.
[0028] In an embodiment, the data 203 stored in the memory 202 may include, without limitation, values/texts related to one or more battery parameters 204, one or more vehicle parameters 209, a predefined SOC value 206, a first and a second predefined time-period 207 and other data 208. In some implementations, the data 203 may be stored within the memory 202 in the form of various data structures. Additionally, the data 203 may be organized using data models, such as relational or hierarchical data models. The other data 208 may include various temporary data and files generated by the different components of the controller 109.
[0029] In an embodiment, the one of more battery parameters 204 may be such as but not limited to health of dual battery, a voltage, a capacity, a power and a current.
[0030] In an embodiment, the one or more vehicle parameters 209 may be such as but not limited to an ignition condition, an engine condition, an engine RPM condition, a vehicle speed condition, a service brake condition, a parking light condition and the like. The one or more vehicle parameters 209 may be determined based on one or more inputs received from one or more sensors of the vehicle.
[0031] In an embodiment, the predefined SOC value 206 comprises a first predefined threshold value, a second predefined threshold value, a third predefined threshold value and a fourth predefined threshold value. The first predefined threshold value and the second predefined threshold value is related to determining an SOC value and facilitating charging for a first battery 101. The third predefined threshold value and the fourth predefined threshold value is related to determining the SOC value and facilitating the charging and discharging of the second battery 113. As an example, the third predefined threshold value and the fourth predefined threshold value may be twenty percentage and sixty percentage, respectively. The first predefined threshold value and the second predefined threshold value may be eighty percentage and eighty-five percentage, respectively.
[0032] In an embodiment, the first and the second predefined time-period 207 is utilized for charging of the second battery 113 for the first predefined time-period and discharging of the

second battery 113 for the second predefined time-period upto the third predefined threshold value when the SOC value of the first battery 101 is greater than the first predefined threshold value and the SOC value of the second battery 113 is greater than the fourth predefined threshold value. As an example, the first and the second predefined time-period 207 may be three minutes and seven minutes, respectively.
[0033] In an embodiment, the data 203 may be processed by the one or more modules 205 of the controller 109. In some implementations, the one or more modules 205 may be communicatively coupled to an Electronic Controller Unit (ECU) for performing one or more functions of the controller 109. In an implementation, the one or more modules 205 may include, without limiting to, a determining module 210, a charge facilitating module 211 and other modules 212. In an embodiment, the other modules 212 may be used to perform various miscellaneous functionalities of the controller 109. It will be appreciated that such one or more modules 205 may be represented as a single module or a combination of different modules.
[0034] In an embodiment, the determining module 210 is configured to determine the one or more battery parameters 204 and the one or more vehicle parameters 209. In a further embodiment, the determining module 210 is configured to determine the State of Charge (SOC) value of the first battery 101 and the second battery 113 based on the one or more battery parameters 204 received from the one or more sensors of the vehicle. The determining module 210 is further configured to determine an engine status and an ignition status of the vehicle using the one or more vehicle parameters 209. The engine status and the ignition status are one of ON or OFF.
[0035] The charge facilitating module 211 is configured to facilitate charging of the second battery 113 for the first predefined time-period and discharging of the second battery 113 for the second predefined time-period upto the third predefined threshold value when the SOC value of the first battery 101 is greater than the first predefined threshold value and the SOC value of the second battery 113 is greater than the fourth predefined threshold value. The charge facilitating module 211 is further configured to facilitate the charging of the first battery 101 for a time-period until the SOC value of the first battery 101 reaches the second predefined threshold value, when the SOC value of the first battery 101 is less than the first predefined threshold value. The second predefined time-period is greater than the first predefined time-period. The charge facilitating module 211 is further configured to facilitate charging of the second battery 113 when the SOC value of the second battery 113 is less than the third

predefined threshold value. The charging is facilitated until the SOC of the second battery 113 reaches the fourth predefined threshold value.
[0036] The other modules 212 is configured to compare the SOC value of the second battery 113 with the third predefined threshold value, when the SOC value of the first battery 101 is greater than the first predefined threshold value. The other modules 212 is further configured to switching OFF an alternator 111 in the vehicle for the second predefined time-period and switching ON the alternator 111 for the first predefined time-period, when the second battery 113 is charged upto the fourth predefined threshold value. The other modules 212 is further configured to notify charging status and discharging status to a user via an instrument cluster 112.
[0037] FIG. 3A depicts a flowchart illustrating a method 300A for operating a dual battery, in accordance with some embodiments of the present disclosure.
[0038] At step 301, a State of Charge (SOC) value of a first battery 101 and a second battery 113 is determined based on one or more battery parameters 204 received from one or more sensors of a vehicle.
[0039] In an embodiment, a SOC value of the first battery 101 and the second battery 113 is determined based on status of one or more vehicle parameters 209.
[0040] Further, the SOC values for dual batteries are checked based on the steps given below.
[0041] At step 303, charging of the second battery 113 for a first predefined time-period and discharging of the second battery 113 for a second predefined time-period upto a third predefined threshold value is facilitated, when the SOC value of the first battery 101 is greater than a first predefined threshold value and the SOC value of the second battery 113 is greater than a fourth predefined threshold value.
[0042] The method 300A further comprises switching OFF an alternator 111 in the vehicle for the second predefined time-period and switching ON the alternator 111 for the first predefined time-period, when the second battery 113 is charged upto the fourth predefined threshold value. The second predefined time-period is greater than the first predefined time-period.
[0043] FIG. 3B depicts a flowchart illustrating a method 310 for facilitating charging of a first battery 101, in accordance with some embodiments of the present disclosure.

[0044] At step 311, charging of the first battery 101 is facilitated for a time-period until the SOC value of the first battery 101 reaches a second predefined threshold value, when the SOC value of the first battery 101 is less than the first predefined threshold value.
[0045] FIG. 4 depicts a flowchart 400 illustrating an exemplary method of operating a dual battery, in accordance with some embodiments of the present disclosure.
[0046] At step 401, a check is performed if an ignition of a vehicle is ON or OFF. If the ignition is OFF then at step 403, electrical loads 115 are driven by a Li ion battery and a controller 109 is in a sleep mode.
[0047] If the ignition is ON, then at step 402, a check is performed if an engine is ON or OFF.
[0048] If the engine is OFF, then at step 405, all the electrical loads 115 are driven by the Li ion battery.
[0049] If the engine is ON, then at step 404, a check is performed if an engine Revolutions Per Minute (RPM) is between 600 RPM to 4500RPM.
[0050] If the engine Revolutions Per Minute (RPM) is not between 600 RPM to 4500RPM then, the step 405 is executed.
[0051] Further, if the engine Revolutions Per Minute (RPM) is between 600 RPM to 4500 RPM, then at step 406, a check is performed if a vehicle speed is greater than zero kilometers per hour.
[0052] If the vehicle speed is greater than zero kilometers per hour, then at step 407, a check is performed if a service brake of the vehicle is ON or OFF. If the service brake of the vehicle is ON, then at step 408, a check is performed if a parking light of the vehicle is ON or OFF. If the parking light of the vehicle is OFF, then at step 414, the Li ion battery is charged with a regenerative input using an alternator 111 and a corresponding maximum feasible output current is provided.
[0053] Furter, if the vehicle speed is not greater than zero kilometers per hour, if the service brake is OFF, then at step 409, a check is performed if a lead acid battery State of Charge (SOC) is greater than eighty percentage.

[0054] If the lead acid battery State of Charge (SOC) is less than eighty percentage, then at step 411, a lead acid battery is charged with a 14.5V upto eighty-five percentage SOC. Further at the step 411, after charging upto the eighty-five percentage SOC, the alternator 111 may not provide the 14.5V to the lead acid battery.
[0055] Further, if the lead acid battery State of Charge (SOC) is greater than eighty percentage, then at step 410, a check is performed if Li ion battery SOC is greater than twenty percentage.
[0056] If the Li ion battery SOC is greater than twenty percentage, then at step 412, all the electrical loads 115 are driven by the Li ion battery. Further, at the step 412, the alternator 111 follows a seven minute OFF cycle and a three minute ON cycle.
[0057] If the Li ion battery SOC is less than twenty percentage, then at step 413, the Li ion battery is charged with the 14.5V upto sixty percentage SOC. Further, after reaching the sixty percentage SOC, then at the step 413, the alternator 111 follows the seven minutes OFF cycle and the three minute ON cycle.
[0058] For example, a first battery 101 may also be referred as the lead acid battery and a second battery 113 may also be referred as the Li ion battery.
[0059] It should be noted that the FIG.4 does not limit the scope of the claim, this is present as an example, and the FIG.4 is described to provide more clarity about the present disclosure.
[0060] The present disclosure provides an improvement in fuel economy as the present disclosure discloses switching ON and OFF cycle for the alternator 111. Further, as magnetic clogging effects gets nullified during the alternator OFF condition, which leads to improvement in the fuel economy. The present disclosure may utilize regenerative power. The present disclosure provides reliability as the controller 109 may also be present in a sleep mode. In case the vehicle is discharged, the lead acid battery may be able to provide high spike of voltage and current during next cranking. The present disclosure enhances life cycle of the first battery 101 and the second battery 113 as the present disclosure follows charging and discharging cycle for the first battery 101 and the second battery 113.
[0061] In light of the technical advancements provided by the disclosed method and the control module, the claimed steps, as discussed above, are not routine, conventional, or well-known aspects in the art, as the claimed steps provide the aforesaid solutions to the technical problems

existing in the conventional technologies. Further, the claimed steps clearly bring an improvement in the functioning of the system itself, as the claimed steps provide a technical solution to a technical problem.
[0062] The terms "an embodiment", "embodiment", "embodiments", "the embodiment", "the embodiments", "one or more embodiments", "some embodiments", and "one embodiment" mean "one or more (but not all) embodiments of the invention(s)" unless expressly specified otherwise.
[0063] The terms "including", "comprising", “having” and variations thereof mean "including but not limited to", unless expressly specified otherwise.
[0064] The enumerated listing of items does not imply that any or all the items are mutually exclusive, unless expressly specified otherwise. The terms "a", "an" and "the" mean "one or more", unless expressly specified otherwise.
[0065] A description of an embodiment with several components in communication with each other does not imply that all such components are required. On the contrary, a variety of optional components are described to illustrate the wide variety of possible embodiments of the invention.
[0066] When a single device or article is described herein, it will be clear that more than one device/article (whether they cooperate) may be used in place of a single device/article. Similarly, where more than one device/article is described herein (whether they cooperate), it will be clear that a single device/article may be used in place of the more than one device/article or a different number of devices/articles may be used instead of the shown number of devices or programs. The functionality and/or features of a device may be alternatively embodied by one or more other devices which are not explicitly described as having such functionality/features. Thus, other embodiments of invention need not include the device itself.
[0067] Finally, the language used in the specification has been principally selected for readability and instructional purposes, and it may not have been selected to delineate or circumscribe the inventive subject matter. It is therefore intended that the scope of the invention be limited not by this detailed description, but rather by any claims that issue on an application based here on. Accordingly, the embodiments of the present invention are intended to be

illustrative, but not limiting, of the scope of the invention, which is set forth in the following claims.
[0068] While various aspects and embodiments have been disclosed herein, other aspects and embodiments will be apparent to those skilled in the art. The various aspects and embodiments disclosed herein are for purposes of illustration and are not intended to be limiting, with the true scope and spirit being indicated by the following claims.

WE CLAIM:
1. A method for operating dual battery in a vehicle, the method comprises:
determining, by a controller (109), a State of Charge (SOC) value of a first battery (101) and a second battery (113) based on one or more battery parameters (204) received from one or more sensors of the vehicle; and
facilitating, by the controller (109), charging of the second battery (113) for a first predefined time-period and discharging of the second battery (113) for a second predefined time-period until the SOC of the second battery (113) is less than a third predefined threshold value, when the SOC value of the first battery (101) is greater than a first predefined threshold value and the SOC value of the second battery (113) is greater than a fourth predefined threshold value.
2. The method as claimed in claim 1 comprises:
determining an engine status and an ignition status of the vehicle using one or more vehicle parameters (209), wherein the engine status and the ignition status is one of: ON and OFF.
3. The method as claimed in claim 2, wherein determining the one or more vehicle
parameters (209) comprises:
determining, if the engine Revolutions Per Minute (RPM) is in a normal range;
comparing, the SOC value of the first battery (101) with the first predefined threshold value;
determining, if a vehicle speed is atleast one of: lesser and greater than predefined range;
determining, if a service brake condition is either one of: ON and OFF; and
determining, if parking light switch is either one of: ON and OFF.
4. The method as claimed in claim 1, wherein when the ignition status is ON and the
engine status if OFF, powering electrical loads (115) in the vehicle using the second
battery (113).

5. The method as claimed in claim 2, wherein determining the SOC value of the first battery (101) and the second battery (113) is based on status of the one or more vehicle parameters (209).
6. The method as claimed in claim 1 further comprises:
facilitating the charging of the first battery (101) for a time-period until the SOC value of the first battery (101) reaches a second predefined threshold value, when the SOC value of the first battery (101) is less than the first predefined threshold value.
7. The method as claimed in claim 2 comprises:
comparing the SOC value of the second battery (113) with the third predefined threshold value, when the SOC value of the first battery (101) is greater than the first predefined threshold value; and
facilitating charging of the second battery (113) when the SOC value of the second battery (113) is less than the third predefined threshold value, wherein the charging is facilitated until the SOC of the second battery (113) reaches the fourth predefined threshold value.
8. The method as claimed in claim 1 wherein in facilitating, charging and discharging of
the second battery (113) further comprises:
switching, OFF an alternator (111) in the vehicle for the second predefined time-period and switching ON the alternator (111) for the first predefined time-period.
9. The method as claimed in claim 1, wherein the second predefined time-period is greater than the first predefined time-period.
10. A controller (109) for operating dual battery in a vehicle, wherein the controller (109) is configured to:
determine a State of Charge (SOC) value of a first battery (101) and a second battery (113) based on one or more battery parameters (204) received from one or more sensors of the vehicle; and
facilitate charging of the second battery (113) for a first predefined time-period and discharging of the second battery (113) for a second predefined time-period until the SOC of the second battery (113) is less than a third predefined threshold value,

when the SOC value of the first battery (101) is greater than a first predefined threshold value and the SOC value of the second battery (113) is greater than a fourth predefined threshold value.
11. The controller (109) as claimed in claim 10 comprises:
determining an engine status and an ignition status of the vehicle using one or more vehicle parameters (209), wherein the engine status and the ignition status is one of: ON and OFF.
12. The controller (109) as claimed in claim 10 wherein determining status the one or more
vehicle parameters (209) comprises:
determining, if the engine Revolutions Per Minute (RPM) is in a normal range;
comparing, the SOC value of the first battery (101) with the first predefined threshold value;
determining, if a vehicle speed is atleast one of: lesser and greater than predefined range;
determining, if a service brake condition is either one of: ON and OFF; and
determining, if parking light switch is either one of: ON and OFF.
13. The controller (109) as claimed in claim 12 wherein when the ignition status is ON and the engine status if OFF, powering electrical loads (115) in the vehicle using the second battery (113).
14. The controller (109) as claimed in claim 10 wherein determining the SOC value of the first battery (101) and the second battery (113) is based on status of the one or more vehicle parameters (209).
15. The controller (109) as claimed in claim 12 further comprises:
facilitating the charging of the first battery (101) for a time-period until the SOC value of the first battery (101) reaches a second predefined threshold value, when the SOC value of the first battery (101) is less than the first predefined threshold value.
16. The controller (109) as claimed in claim 10 comprises:

comparing, the SOC value of the second battery (113) with the third predefined threshold value, when the SOC value of the first battery (101) is greater than the first predefined threshold value; and
facilitating charging of the second battery (113) when the SOC value of the second battery (113) is less than the third predefined threshold value, wherein the charging is facilitated until the SOC of the second battery (113) reaches the fourth predefined threshold value.
17. The controller (109) as claimed in claim 10 wherein in facilitating, charging, and
discharging of the second battery (113) further comprises:
switching, OFF an alternator (111) in the vehicle for the second predefined time-period and switching ON the alternator (111) for the first predefined time-period.
18. The controller (109) as claimed in claim 10, wherein the second predefined time-period is greater than the first predefined time-period.
19. The controller (109) as claimed in claim 10, the one or more battery parameters (204) comprises health of the dual battery, voltage, capacity, power and current.