... 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 allows more efficient,faster charging.5 ... voltage as per customers different kinds of lead-acid battery.10,Operating temperature:0-50 ,Storage temperature:-10 - +60 .Safety protections: Over ...