... design Sophisticated technology Portable size light weight battery charger rectifier Features:1. CC, CV 3-stage charger2. Reliable, elegant3. Small size, ... use both 110Vac and 220Vac.2,Efficiency: 85%-90%.3,Convection cooling eliminates the need for a cooling fan.4 ... charging voltage as per customers different kinds of lead-acid battery.10,Operating temperature:0-50 ,Storage temperature:-10 - +60 . ...