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Windows HID UPS Battery device hibernating with 98% of battery left.
I am running Windows 10 22H2 OS Build 19045.3324 on an HP G2 SFF desktop PC. It is powered by an APC Back UPS BE550G-CN and I am using the stock Windows HID UPS Battery device driver. I had the critical battery level set to 5% (for both AC and battery) and the critical battery action set to hibernate (for both AC and battery).
This has worked fine for three years and most of our outages are relatively short so the UPS has kept the PC operating fine for up to 50 minutes, but the last time there was a power failure the PC shutdown within a few seconds of the loss of AC with event ID 524, Critical battery level met. When I looked at the event details it shows:
Event Data
Index 0
ActiveBatteryCount 1
RemainingPercentage 100
IsAcOnline 0
BatteryActionInternalFlags 0x80
IsPowerActionCallIgnored 0
IsPowerPolicyEnabled 1
PowerPolicyAction 3
PowerPolicyBatteryLevel 5
PowerPolicyEventCode 1
PowerPolicyMinState 4
I wondered if it might be a PC problem but I tried this on two other PCs (same SW version) with the same UPS and got the same result.
Does anyone know why it would trigger the "critical battery level met" when it clearly says there is 100% remaining? Any suggestions for troubleshooting?