Patent ID: 7944178

Claim:
A fully-charged battery capacity detection method of a battery, the method comprising: calculating a capacity variation value of a battery based on an integrated value of charging and discharging currents of the battery to be charged/discharged between a first detection timing and a second detection timing; detecting first and second open-circuit voltages of the battery at the first detection timing and the second detection timing, respectively; determining first and second remaining capacities of the battery based on the first and second open-circuit voltages detected; calculating a remaining capacity variation rate based on a difference between the first and second remaining capacities determined; calculating a fully-charged capacity of the battery based on the remaining capacity variation rate and the capacity change value by the following formula: Ahf=δAh /(δ S/ 100); and transmitting, using a communication processing portion, information including a remaining capacity of the battery determined to an external device that is supplied power from the battery.