How To Change Nest Thermostat Battery. Take the thermostat off of the base unit. If the battery was fully drained, the thermostat might take.

It could be either aa or aaa alkaline or lithium batteries. Your nest thermostat might give you an indication that it is not getting charged and is low on power, or low battery or low charge indication. Nest thermostats internal battery can be recharged via the usb port located on the back of the units.on the thermostat, go to settings > technical info > power.press and hold the thermostat ring until you see the quick view menu.