1,Sealed Lead-acid battery charger 2,Switching Mode Power Supply,MCU control . 3,DC: 48V,20A. 4,CE Certification General Features for 48V/20A battery charger : 1,Ac input: 110Vac or 220Vac as per customers' required, or we can make 110V/220V voltage selector for charger can use both 110Vac and 220Vac.2,Efficiency: 85%-90%.3,Cooling need a fan.4,Automatic,Advanced ,high frequency,swich mode design ...