In a charger for charging a storage battery provided in a load, electric power derived from an external source is converted by a first electric power converter, and stored in an internal battery. A monitoring device is provided to monitor a charge status of the internal battery. An internal battery charge controller is configured to regulate electric power from the first electric power converter to the internal battery based upon the charge status of the internal battery being monitored by the monitoring device. An output power controller is configured to regulate electric power supplied from the internal battery through a connector to the storage battery.