How To Replace Batteries In Nest Thermostat. In case the thermostat has a C-wire installed it will be easier to connect to. The overall lifespan of the thermostat battery depends on the charge that it receives.
Reattach the battery door. You may need to slide it up the wall plate before it will detach. Pull the thermostat display off the base.
- Nest Learning Thermostat 2nd Generation.
The 3rd 4th gen units uses an Energizer. But you can only replace batteries in 1st gen Nest Learning Thermostat. This unit uses a Lithium-Ion rechargeable battery. You can check the battery power level on the thermostat or in the Home app.
