1. A method [100] of charging an energy storage unit having a plurality of cells, the method [100] comprising:
charging, by a power conditioning module, the plurality of cells at a first constant current;
charging, by the power conditioning module, the plurality of cells at a second constant current, wherein
the plurality of cells is charged until a voltage level of the plurality of cells reaches a second voltage, and
the second current is greater than the first current;
charging, by the power conditioning module, the plurality of cells at a third constant current, wherein
the plurality of cells is charged until the voltage level of the plurality of cells reaches a third voltage,
the third voltage is greater than the second voltage, and
the third current is lesser than the second current; and
constantly charging, by the power conditioning module, the plurality of cells at the third voltage, wherein
the plurality of cells is charged until a current level of the plurality of cells reaches a fourth current, and
the fourth current is lesser than the first current.

2. The method [100] as claimed in claim 1, wherein the plurality of cells is charged at the first constant current until the voltage level of each of the plurality of cells reaches a first voltage.
3. The method [100] as claimed in claim 2, wherein the plurality of cells is charged at the first constant current for a pre-determined time period in an event the voltage level of each of the plurality of cells is exceeding the first voltage.
4. The method [100] as claimed in claim 1 and 2, wherein the second voltage is greater than the first voltage.
5. The method [100] as claimed in claim 1, wherein the difference between the second current and the third current is greater than or equal to a maximum current drawn by at least one peripheral.
6. The method [100] as claimed in claim 1, wherein the charging starts subsequent to a readiness test on the power conditioning module.
7. A power conditioning module for charging an energy storage unit having a plurality of cells, wherein the power conditioning module is configured to:
charge the plurality of cells at a first constant current;
charge the plurality of cells at a second constant current, wherein
the plurality of cells is charged until the voltage level of the plurality of cells reaches a second voltage, and
the second current is greater than the first current;
charge the plurality of cells at a third constant current, wherein

the plurality of cells is charged until the voltage level of the plurality of cells reaches a third voltage,
the third voltage is greater than the second voltage, and
the third current is lesser than the second current; and
constantly charge the plurality of cells at the third voltage, wherein
the plurality of cells is charged until a current level of a plurality of cells reaches a fourth current, and
the fourth current is lesser than the first current.
8. The power conditioning module as claimed in claim 7, wherein the plurality of cells is charged at the first constant current until a voltage level of each of the plurality of cells reaches a first voltage.
9. The power conditioning module as claimed in claim 8, wherein the plurality of cells is charged at the first constant current for a pre-determined time period in an event the voltage level of each of the plurality of cells is exceeding the first voltage.
10. The power conditioning module as claimed in claim 7 and 8, wherein the second voltage is greater than the first voltage.
11. The power conditioning module as claimed in claim 7, wherein the difference between the second current and the third current is greater than or equal to a maximum current drawn by at least one peripheral.
12. The power conditioning module as claimed in claim 7, wherein the power conditioning module charges the energy storage unit subsequent to a readiness test on the power conditioning module and/or energy storage unit.

13. The power conditioning module as claimed in claim 7 wherein the power conditioning module comprises a power factor correction unit and a DC to DC converter.
14. The power conditioning module as claimed in claim 13, wherein the DC to DC converter is a phase shift full bridge unit.