... when UPS start-up6. Advanced battery management7.Cold start feature(DC power on)8. Automatically charging batteries in UPS off mode9. Lighting ... and vice versaZeroLED indicatorsStatusLoad level / Battery level, Battery , Utility Power, Inverter, Bypass, Overload, FaultAudible AlarmBypass, On battery mode, Battery low, Overload, FaultCommunicationsRS-232 Serial ...