... Reliable, elegant3. Small size, light, aluminium housing4. Efficient (efficiency ≥88% full load)5. There is a fan to create forced air ... use both 110Vac and 220Vac.2,Efficiency: 85%-90%.3,Convection cooling eliminates the need for a cooling fan.4,Automatic,Advanced ,high ... battery.10,Operating temperature:0-50 ,Storage temperature:-10 - +60 . fast charging and maintenance free forklift battery charger