... make 110V/220V voltage selector for charger can use both 110Vac and 220Vac.2,Efficiency: 85%-90%.3 ... charging.5,Also supply lighter weight and compact size allows on-board use and offers space advantages.6,Aluminum ... ,Over current,over voltage.over temperature,short circuit and reverse polarity protection.8,Led display charging states ... 36V 48V 20A 25A 30A high power li-ion li-polymer battery charger