How To Change Nest Thermostat Battery. The battery of a honeywell thermostat needs to be changed once a year and you will start getting notification for battery replacement 60 days before the battery lasts. This is to conserve power so it can continue controlling your system.
How does a nest thermostat’s internal battery charge? Start by taking the display off the thermostat, then plug the thermostat into your computer usb or any. If your system works as it should with your old thermostat, your nest thermostat may be damaged and needs to be replaced.
Push the thermostat display back onto the base.
Step 4 disconnect the base connection ribbon cable. Your nest thermostat uses the voltage from your system’s wires to keep its internal battery charged. A blown fuse on your system’s control board can prevent power from reaching your thermostat. If the power to your system is switched off or there’s a blackout, the battery has enough capacity to keep working for a while.