MIB: PowerNet-MIB
The current state of the UPS. If the UPS is unable to
 determine the state of the UPS this variable is set
 to unknown(1).
During self-test most UPSes report onBattery(3) but
 some that support it will report onBatteryTest(15).
 To determine self-test status across all UPSes, refer
 to the upsBasicStateOutputState OID.