And as a reminder too, that even some internet-connected thermostats have batteries, like the Google Nest. If your furnace wiring is not recharging it, it can just die. To recharge these, pull the face of the thermostat off the wall and connect it to power via the mini USB plug on the back.
Luckily no bad outcome because there was still life in the one that got low but when they get low they don’t always send accurate signals to the furnace
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