Patent ID: 8159185

Claim:
A charging apparatus, comprising: a first terminal that is used to communicate with a battery apparatus, the battery apparatus including a memory that stores charge state data; a counting unit adapted to count a number of times the charge state data stored in the memory of the battery apparatus has been rewritten; a charge cycle calculating unit adapted to calculate a number of charge cycles based on the counted number of times the charge state data stored in the memory of the battery apparatus has been rewritten; and a control unit that (a) determines charge state data based on a temperature of the battery apparatus, a charge voltage, and a charge current, the determined charge state data representing a charge state of the battery apparatus, (b) corrects full charge capacity data based on the calculated number of charge cycles if the determined charge state data exceeds the charge state data stored in the memory of the battery apparatus and the calculated number of charge cycles is not less than one cycle, and (c) stores the corrected full charge capacity data in the memory of the battery apparatus.