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?
