== Comparison of top 3 batteries used in HEVs ==
During recharging, it is important to maintain the balance of battery. The balance of battery is maintained by controlling battery from overcharging and over discharging.
The battery is controlled by defining State of Charge (SOC) of the battery:
* Upper limit value – overcharge and
* Lower limit value – over discharge
When overcharge is detected, power generation is controlled/cut-off and when over discharge is detected, power supply to electric motor is stopped. Detection is achieved by appropriate sensors.
'''''This report investigates various procedures available/adopted by various assignees in order to maintain balanced battery pack by avoiding overcharge and/or over discharge.
'''''
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