MIB: PowerNet-MIB
The status of the UPS batteries. A batteryLow(3) value
 indicates the UPS will be unable to sustain the current
 load, and its services will be lost if power is not restored.
 The amount of run time in reserve at the time of low battery
 can be configured by the upsAdvConfigLowBatteryRunTime.
 A batteryInFaultCondition(4)value indicates that a battery
 installed has an internal error condition.