Troubleshoot when Nest Protect batteries are low during setup

If Google Nest Protect chirps or notifies you in the app that the batteries are low after initial setup it's possible that the batteries’ voltage has temporarily dropped. This can sometimes happen when it takes longer than expected to connect your new Nest Protect to your Wi-Fi network and add it to your account. There are a couple of solutions depending on what you see and hear.

If you hear a low-battery chirp from Nest Protect

If your Nest Protect chirps right after you've added it to your account in the app, follow these steps to get the batteries back up to a full charge. Take the batteries out for about four hours. They’ll need this time to go back to full charge. Note: Use this article to learn how to remove the batteries and put them back in. Put the batteries back in then press the center button to reconnect it to Wi-Fi. On the Nest app home screen tap on your Protect. Check Battery. It should have a green checkmark next to it, indicating that the battery charge is back to normal. Check the battery charge level

If this doesn’t work and you need to replace the batteries in your Nest Protect with fresh new batteries:

• Only use Energizer Ultimate Lithium AA (L91) lithium-ion batteries.
• Make sure you do not use alkaline batteries.

Note: 

If you don’t get a blue light or welcome message when you remove the battery tab:

1. Remove the batteries from your Protect.
2. Check for pieces of the tab in the battery tray.
3. Put the batteries back in. Make sure to push them in all the way.