The Relm / BK (Bendix King) EPU In-Vehicle Charger will charge your radio battery quickly and properly every time while your on the move. The Relm / BK EPU Charger features advanced diagnostic circuitry and LED flash pattern that identifies battery fault conditions, as well as the level of charge of the battery. The actual charging pod of the Endura charger is replaceable, so as to allow for future use with different radios.