How to Replace Nest Thermostat Batteries
The 2020 Nest Thermostat takes 2 AAA alkaline batteries. Nest Thermostat E and Nest Learning Thermostats use internal rechargeable batteries, so you don't replace those batteries yourself.
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To replace a battery in a Nest Thermostat, use 2 fresh AAA alkaline batteries in the 2020 Nest Thermostat. Nest Thermostat E and Nest Learning Thermostats have internal rechargeable batteries, which aren't designed for user replacement.
Check the model before removing the display. A low battery warning can mean different things depending on which Nest thermostat you have.
For a broader overview, see whether home thermostats use batteries.
Which Nest thermostat batteries can you replace?
Only the 2020 Nest Thermostat uses user-replaceable AAA batteries. Nest Thermostat E and Nest Learning Thermostats use internal rechargeable batteries.
Confirm the model name in the Google Home or Nest app, or on the thermostat itself. If you're unsure, use Google's instructions for your exact model before taking the display off the wall.
The Nest Learning thermostat battery replacement guide explains why those batteries aren't a do-it-yourself swap. For other thermostat brands, see how to replace a thermostat battery.
How do you replace batteries in the 2020 Nest Thermostat?
Remove the thermostat display, replace both AAA alkaline batteries, and reattach the display. Keep the thermostat and wall plate steady as you work.
- Confirm you have the 2020 Nest Thermostat and get 2 new AAA alkaline batteries.
- Pull the display straight off its base, taking care not to tug or twist the wall plate.
- Remove both old batteries from the back of the display.
- Insert the new batteries in the direction marked in the compartment.
- Press the display back onto the base, aligning it with the connector.
- Check the screen and settings to confirm the thermostat has restarted.
Use the battery type and orientation shown on your thermostat. Replace both cells together rather than mixing a fresh one with an old one.
If the display doesn't sit flush or the thermostat doesn't restart, remove it again and check the battery direction and fit. Don't force the display onto the base.
Do you need a special tool or wall plate?
Battery replacement doesn't normally require a special tool. The display comes off its base so you can reach the compartment.
If the wall plate is loose or damaged, fix that separately before pressing the display back into place. If you want to hide the thermostat or marks around it, see cover a thermostat on the wall.
Our guide to the best Nest thermostat wall plate can help you compare replacement plates.
What should you do if the Nest battery warning stays on?
First confirm the model, battery type, and battery direction. If a fresh set doesn't clear the warning, the thermostat may have a power or wiring issue.
For a 2020 Nest Thermostat, reseat both AAA batteries and make sure the display is attached firmly. If the warning returns, use Google's troubleshooting steps for your exact model or contact Google support.
For a Nest Thermostat E or Learning model, don't open the display to change its internal battery. Follow the model-specific instructions to charge it, then check the wiring and HVAC power if the warning persists.
A low battery message can be part of a wider power issue. See why a Nest thermostat battery is low for possible causes and next steps.
Can a room sensor help with a battery problem?
A room sensor won't fix a thermostat battery warning. It can help if your separate concern is that one thermostat reading doesn't reflect the rooms you use.
The ecobee SmartSensor 2-Pack detects occupancy and shares room temperature readings with a compatible ecobee Smart Thermostat. Each sensor uses an included CR2477 battery.
This is an option for an ecobee setup, not an accessory for a Nest thermostat. Choose it only if room-by-room comfort is the issue you want to address.
When might replacing the thermostat make sense?
Consider a replacement only if the thermostat has ongoing problems beyond a one-time battery change. Check the model's power requirements and your HVAC wiring before choosing another thermostat.
The Sensi Smart Thermostat includes 2 AA batteries and has app-based installation instructions. It may suit someone comparing thermostats, but its batteries and setup aren't a repair kit for a Nest.
If you replace your thermostat, follow the new model's wiring instructions and check compatibility with your HVAC system. For battery steps on other brands, read how to replace Honeywell thermostat batteries, how to change Braeburn thermostat batteries, or how to replace Trane thermostat batteries.
Is a plug-in temperature controller a Nest battery replacement?
No. A plug-in temperature controller doesn't power or replace a Nest thermostat.
It controls compatible heating devices for uses such as seed starting or reptile enclosures.
The BN-LINK controller is intended for heating devices, such as heat mats and heat lamps. It isn't designed for central HVAC or as a substitute for a wall thermostat.
What is the right next step for your Nest model?
If you have the 2020 Nest Thermostat, replace both AAA alkaline batteries and check that the display is seated correctly. If you have a Nest Thermostat E or Nest Learning Thermostat, follow its charging and power troubleshooting instructions instead of trying to replace the internal battery.
If a low battery warning keeps returning, use the model-specific troubleshooting guide or contact Google support. For symptoms and possible causes, see why your Nest thermostat battery is low.
Frequently asked questions
Which Nest thermostats have replaceable batteries?
The 2020 Nest Thermostat uses 2 AAA alkaline batteries that you can replace. Nest Thermostat E and Nest Learning Thermostats have internal rechargeable batteries instead.
Check the model name in the Google Home or Nest app, or on the thermostat, before opening it.
What batteries go in a Nest Thermostat?
The 2020 Nest Thermostat uses 2 AAA alkaline batteries. Match the type and polarity shown in the battery compartment, and replace both batteries together.
Nest Thermostat E and Nest Learning models do not use user-replaceable AAA batteries.
How do you charge a Nest Learning Thermostat with a low battery?
A Nest Learning Thermostat has an internal rechargeable battery. If it reports low battery, connect the display to a USB power source using the cable and port specified for your model, then check its wiring and power if the warning returns.
Don't pry open the display.
Why is my Nest Thermostat battery low after replacing it?
If the thermostat uses replaceable AAA batteries, confirm both are fresh alkaline cells and seated in the correct direction. If the low battery alert returns, check that the display is attached securely and review wiring or power issues.
Learning models need charging or a power check, not new AAA batteries.
