Patent ID: 8305040

Claim:
A battery charging method, implemented by a control circuit so as to charge a battery according to a charge-off current, comprising: reading an actual capacity parameter of the battery, wherein the actual capacity parameter of the battery represents a full charge capacity of the battery or a percentage representative of the full charge capacity of the battery divided by a design capacity of the battery; reading a default regulation defining a plurality of battery capacity regions including a first battery capacity region and a second battery capacity region; determining whether the actual capacity parameter of the battery is in the first battery capacity region or the second battery capacity region; charging the battery according to a first charge-off current when determining the actual capacity parameter of the battery is within the first battery capacity region; and charging the battery according to a second charge-off current when determining the actual capacity parameter of the battery is within the second battery capacity region; wherein the first battery capacity region and the second battery capacity region are different, and the first charge-off current is smaller than the second charge-off current.