Nightly Promise will tell you about the battery charge
When you turn off the lights for the night, Nest Protect’s Nightly Promise lets you know everything is working, and that the batteries are at a safe level. If the batteries are low, you’ll see a yellow light and you’ll get a message telling you to replace the batteries soon.
You can also check the battery level at any time with the Nest app.
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How to check Protect’s battery level with the Nest app 1. On the app home screen, tap or click on the Protect you Wired and battery powered Nest Protects both use batteries |
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Battery powered Nest Protect
When Nest Protect has less than about a year of battery life remaining, it will give you a warning that the batteries are getting low. Nest Protect will pulse yellow when you turn off the lights at night and after you press the Nest button it will say: “The battery is low. Replace the battery soon.” You will also receive a message in the Nest app.
Nest Protect will pulse yellow again and send you a second warning in the Nest app when there’s only a few months of battery life left. When Nest Protect has only a few weeks of battery life left, it will chirp until the batteries are replaced.
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Nest Protect |
Nest app |
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Good battery 
Nightly Promise light glows green. |
Everything is OK. |
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Low battery 
Nightly Promise light glows yellow. |
The battery is low. Replace the battery soon. Your Nest Protect will need new batteries in the coming months. Pathlight is off until the batteries have been replaced. |
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Very low battery
Nightly Promise will glow yellow and let you know the battery is getting low. |
The battery is very low. Replace the battery now. Your Nest Protect will need new batteries in the coming months. Pathlight is off until the batteries have been replaced. |
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Critical battery
Nightly Promise will glow yellow and let you know the battery is very low and needs to be replaced. Your Nest Protect will also no longer connect to Wi-Fi and will chirp regularly day and night. |
The battery is very low. Replace the battery now. Your Nest Protect needs new batteries immediately. Only a few days of battery life remain. Nest Protect will start chirping soon – day and night. |
Wired Nest Protect
When there’s a power outage, wired Nest Protects use their backup batteries to keep all features up and running. If the backup battery charge is low, the Nest Protect light ring will glow yellow. When you press the Nest button, Nest Protect will say: “Nest Protect battery is low. Replace it soon.”
We designed wired Nest Protect for multiple years of battery life. If you have a consistent source of power, the backup batteries should last the life of the Nest Protect.
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Nest Protect |
Nest app |
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Good battery
Nightly Promise light glows green. |
N/A |
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Low battery
Nightly Promise will glow yellow and let you know the backup battery is very low and needs to be replaced. |
The backup battery is dying. Replace the battery now. Nest Protect may not work if the power goes out. Nest Protect will start chirping day and night. |
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Critical battery
Nightly Promise will glow yellow and let you know the backup battery is dead and needs to be replaced now. |
The backup battery is dead. Replace now. Nest Protect will not work at all if line voltage 120V is lost. Replace the backup battery now. |