Patent ID: 8421406

Claim:
A charge control circuit that controls a charging unit which charges a lead storage battery used as a power source of a battery-operated device, comprising: a first acquisition unit that acquires, according to an instruction of charge start, a total discharge electric quantity of the lead storage battery during a period from an end time of a previous charge to a start time of a present charge, the total discharge electric quantity being separated into a first discharge electric quantity which is a discharge electric quantity of a discharge current having a current value of less than a predetermined level, and a second discharge electric quantity which is a discharge electric quantity of a discharge current having a current value of not less than the predetermined level; a computing unit that obtains a first charge electric quantity corresponding to the first discharge electric quantity acquired by the first acquisition unit, a second charge electric quantity corresponding to the second discharge electric quantity acquired by the first acquisition unit, and a charge electric quantity required for charging the lead storage battery as a sum of the obtained first charge electric quantity and second charge electric quantity; and a charge control unit that controls a charge of the lead storage battery by the charging unit based on the charge electric quantity obtained by the computing unit.