1,Sealed Lead-acid battery charger 2,Switching Mode Power Supply,MCU control . 3, ... 110Vac and 220Vac.2,Efficiency: 85%-90%.3,Cooling need a fan.4,Automatic,Advanced ,high frequency,swich mode design allows ... max charging voltage as per customers different kinds of lead-acid battery.10,Operating temperature:0-50 ,Storage temperature:-10 - +60 ...