CHARGER, BATTERY PACK, AND CHARGING SYSTEM USING THE CHARGER AND BATTERY PACK

A charge control means (10) provided for a battery charging apparatus (1) conducts protection control for a battery pack (2) by transmitting a signal to an output control switch (14) for turning off an output when a rise rate of the temperature of the battery pack (2) detected based on information from a temperature detection terminal (8) is equal to or more than a predetermined value, or a rise rate of the voltage of the battery pack (2) detected based on information from a voltage detection terminal (9) is equal to or less than a predetermined value.