Mickey: Why does my PC shut down even though it's connected to a UPS?

This is strange, plugged the USB monitoring cable from the APC UPS into the PC, suddenly Win 10 said if the battery was low, even though this morning it wasn't there when I am to turn off the PC then turn off the UPS by turning off the socket switch too, the APC UPS battery icon was still full.

The warning on Win 10 tonight was that the battery was low, suddenly the PC turned off after entering Windows, so I unplugged the USB monitoring cable from the PC to the APC UPS, the PC suddenly...

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