If Google Nest Protect chirps or signals low batteries in the Nest app 
If you get a low-battery message in the app but Nest Protect doesn't chirp
If the battery is low, you’ll get a message in the Nest or Home app after you’ve added your Nest Protect to your account. If you don’t hear a chirp, proceed to mount it on your wall or ceiling. Wait a day or 2 and check if the issue resolves itself.
If you hear a low-battery chirp from Nest Protect
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If your Nest Protect chirps right after you add it to your account in the Nest or Home app, follow these steps. These steps bring the batteries back to a full charge. Learn more on how to check the battery charge level.
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If this doesn’t work and you need to replace the batteries in your Nest Protect with new ones:
- Only use Energizer Ultimate Lithium AA (L91) lithium-ion batteries.
- Make sure you don't use alkaline batteries.
Note:
If you don’t get a blue light or welcome message when you remove the battery tab:
- Remove the batteries from your Protect.
- Check for pieces of the tab in the battery tray.
- Put the batteries back in. Make sure to push them all the way in.