How to Change the Battery in Your Nest Thermostat

Your Nest thermostat runs on two AA batteries that you can swap yourself in about two minutes

When your Nest thermostat displays a low battery warning or stops responding, the fix is straightforward: open the device, slide out the old batteries, and insert fresh AA batteries in their place. You do not need any tools, and you do not need to call anyone. The whole process takes less time than it takes to find the batteries.

The battery compartment is on the back of the thermostat, hidden behind the display unit. Once you know where to look and which direction the batteries go, changing them becomes something you can do without thinking about it the next time.

Key Takeaways

Nest thermostats use two AA alkaline batteries that sit in a compartment on the back of the device.
You access the batteries by gently pulling the display screen away from the wall plate, which takes only a light tug.
The batteries slide out horizontally and must be reinserted with the positive end (marked with a +) facing toward the spring inside the compartment.
After you insert new batteries, the thermostat will power back on within seconds and resume normal operation.
If the thermostat still does not respond after a battery change, the device itself may need service, but a low battery warning almost always means the batteries need replacing.

What you need before you start

Gather two fresh AA alkaline batteries before you begin. Alkaline batteries work best in Nest thermostats — avoid rechargeable or lithium batteries, as they can cause the device to behave unpredictably. Check the package to confirm the batteries are AA size and alkaline.

You do not need a screwdriver, a ladder, or any special tools. If your thermostat is mounted high on a wall, you may want a small step stool so you can reach it comfortably, but that is optional. Have the new batteries in your hand before you touch the thermostat.

How to remove the display screen

The Nest thermostat consists of two pieces: a wall plate that stays mounted to your wall, and a display screen that sits on top of it. The batteries are behind the wall plate, so you need to separate the display from the base first.

Stand in front of the thermostat and place your fingers on the sides of the display screen — the round part you normally look at. Pull gently and steadily toward you. The screen will slide off the wall plate with light resistance. Do not yank or twist it; a slow, even pull works every time. Once the display comes free, set it aside on a clean surface where it will not get knocked over.

Locating and removing the old batteries

With the display screen removed, you are looking at the wall plate. On the back of this plate, you will see a small rectangular compartment with two slots. Each slot holds one AA battery. The batteries sit horizontally, side by side.

Look at the compartment and you will see a small metal spring at one end of each slot. That spring pushes against the positive end of the battery (the end marked with a + sign). To remove a battery, gently push it toward the spring side, which compresses the spring slightly and allows the battery to slide out the other end. Repeat this for the second battery. Both old batteries can go in the trash or a battery recycling bin.

Installing the new batteries correctly

This is the step where people most often make a mistake, so pay attention to the direction. Each new battery must go in with the positive end (the + side) facing toward the spring. Look at the compartment again: the spring is at one end of each slot, and the open end is at the other. The positive end of the battery goes toward the spring.

Slide the first new battery into the left slot with the + end facing the spring. Push it in gently until it sits flat and the spring compresses slightly. You should feel a light resistance, but not a hard stop. Repeat with the second battery in the right slot. Both batteries should sit at the same depth and feel secure.

Reattaching the display and confirming power

Once both batteries are in place, pick up the display screen and align it with the wall plate. The screen will only fit one way, so if it does not slide on smoothly, rotate it slightly and try again. Push the display gently back onto the wall plate until it clicks or seats fully. You will feel a small snap when it is in the right position.

Within a few seconds, the thermostat screen will light up and show the current temperature and time. If it displays a low battery warning, the batteries may not be inserted correctly — pull the display off again and check that both batteries are pushed all the way in with the positive ends facing the springs. If the screen lights up normally and the warning is gone, the battery change is complete.

What to do if the thermostat still does not work

If the display screen does not light up after you insert fresh batteries and reattach it, try removing the batteries again, waiting 30 seconds, and reinserting them. Sometimes the device needs a moment to reset. Make sure the positive ends are facing the springs and that both batteries are pushed in fully.

If the thermostat still does not respond after this second attempt, the wall plate itself may have a hardware issue that requires service. Contact Google Nest support and describe what you have tried. In most cases, a low battery warning means the batteries simply need replacing, and the thermostat will work normally once you install fresh ones.

Frequently Asked Questions

Can I use rechargeable batteries in my Nest thermostat?

No. Rechargeable and lithium batteries can cause the thermostat to malfunction or drain faster than expected. Stick with standard AA alkaline batteries from any store.

How often do I need to change the batteries?

Most Nest thermostats run on the same pair of batteries for two to three years, depending on how often the device powers on and communicates with your Wi-Fi. The thermostat will display a low battery warning weeks before the batteries actually die, giving you time to plan the change.

What if I put the batteries in backward?

If you insert a battery with the negative end facing the spring, the thermostat will not power on. The display screen will stay dark. Simply remove the display, flip the battery around so the + end faces the spring, and reattach the screen.

Do I lose my settings when I change the batteries?

No. Your temperature settings, schedule, and all other preferences are stored in the thermostat's memory and will remain intact after a battery change. The device will resume normal operation as soon as the new batteries are installed.

Is there a way to avoid changing batteries so often?

The battery life is built into the design and cannot be extended. However, if your thermostat is connected to Wi-Fi and synced with your Google account, you can check the battery status in the Google Home app to know when a change is coming. This lets you plan ahead instead of being surprised by a low battery warning.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.