System for executing charge control of a secondary battery and detecting the capacitance thereof

摘要

A system comprises a rechargeable battery charged with a constant voltage and a charger. The battery includes a storage unit storing identification data and control voltage data and the charger is assigned identification data. The charger reads the identification data from the storage unit and charges the battery in accordance with the control voltage data, if the stored identification data coincides with the assigned charger identification data. If the stored identification data does not coincide with the assigned charger identification data, the charger gradually increases a charge voltage while detecting overvoltage of the battery, calculates a control voltage of the charger, and charges the battery in accordance with the calculated control voltage.