NOVELTY - If a mode-setting acceptance section accepts a setting of an ordinary charge mode, then a charge control section (31) allows charging-voltage supply section to supply set voltage equal to or below reference voltage as charging voltage, to the secondary battery (141). If the mode-setting acceptance section accepts the setting of high-voltage charge mode, the charge control section allows charging-voltage supply section to supply second set voltage above reference voltage as charging voltage. This allows the secondary battery to be charged at a constant voltage charge.    USE - Charging system for use as a battery mounting apparatus for electronic equipment such as a notebook personal computer and a digital camera, a vehicle such as an electric automobile and a hybrid car, or similar devices.    ADVANTAGE - The charging voltage can be heightened beyond the reference voltage without damaging the secondary battery, increasing the battery capacity. The first of the set voltages equal to or below the reference voltage is supplied as the charging voltage from the charging apparatus to the secondary battery so that it is charged. This lowers the possibility that lithium may be deposited on the negative electrode. As a result, the secondary battery is restrained from deteriorating so that its life can be secured. In response to the user's demands, this makes it possible to increase the secondary battery's battery capacity, or restrain the secondary battery from deteriorating so that its life can be secured. This increases the battery capacity of the secondary battery and restrains the secondary battery from deteriorating so that its life can be secured in response to the needs of a user.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for    (1) charging apparatus;    (2) battery pack    DESCRIPTION OF DRAWING(S) - The drawing shows a block diagram an alternative charging system configuration.    Control integrated circuit (30)    Charge control section (31)    Secondary battery (141)    Charge-discharge control section (211)    Constant-current charge control section (212)