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Power Off HVAC After Thermostat Charging?

Community Member

Good afternoon.  I have a relatively minor question regarding installation of two thermostats.  Basically, one of them appears to be low on battery power. I cannot interact with the device, & nothing happens when I click on the bezel (the device was also flashing red quickly).  Assuming it was a battery issue I thought the thermostat needed charging. I charged it using an existing USB-C cable, & assumed it would finish quickly (I've seen conflicting reports how long it takes).  Given this, I disconnected it from the wall plug, & let it charge for several hours.  The light never stopped flashing.  Assuming it is fully charged, can I plug it safely back into the wall plug, or do I need to turn off my HVAC first?