The Relm / Bendix King KNG-P500 Charger - Endura will charge your radio battery quickly and properly every time. The Endura for Relm / BK KNG-P500 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.