... for 12V/25A 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. ... temperature:0-50 ,Storage temperature:-10 - +60 .Please send me inquiry,any questions about 12V/25A battery charger. 12V/25 A Lead-acid Battery Charger