UPS850VA/450Watts,AVR, CPU control,SMT PCB, LCD display,USB,4 battery backup &2 surge protection,12 ... Wave FormStep WavePower Factor0.6Efficiency90%Transfer Time10msBatteries&RuntimeBattery TypeMaintenance-free Sealed Lead-Acid Battery,LeakproofIncluded Battery Modules1×12V/9 ... 5 MinutesHalf Load 6.0 MinutesCharge Time12 Hours(90%)LCD Status DisplayNormal,Fault,Battery,Charge,Overload,Load,Battery ...