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Another user with Nest Protect and a very HOT battery.

Community Member

So about 3 in the morning, we stated getting beeps. Found out it was one of the smoke detectors that we purchased about 5 years ago. Seemed like a normal low battery thing.

I took the detector down, and began removing the batteries. Everything seemed fine until got to one battery that almost burned my fingers it was soooo hot. Even after 5 minutes of removing the battery , it was still very hot to the touch. Eventually i put the battery outside to be safe. I took down my other smoke detectors, and their batteries were normal temperature. 

I did contact support. They are saying NOT to use the smoke detector that had the battery issue. However, they are saying the other 2 detectors are fine, and I do not need to replace the batteries. 

They said another team will contact me shortly help with the bad detector. 

I just wanted to add to the list of battery issues with the 2nd Gen Nest Protects. 

Has anyone heard any official word on the cause of the overheating battery? Is this normal battery behavior when they get low, or is this a defect in the smoke detectors themselves? Seems like a common issue now, and i would think there would be a statement. One the plus side, i haven't read of any fires started by them (yet), so i guess that's a plus.



Not applicable

If you haven't replaced the batteries of your Nest Protect since you bought it, this kind of issue happens but we can't say it's a common thing. However, can you test replacing the old batteries with Energizer Ultimate Lithium AA L91, to test if you can hear the beeping sound or the battery will heat up, then if it is, then the device might be defective.

Community Member

If this was something to be expected, i would imagine Google would have shown me some sort of safety data sheet or KB articles that explained the issue. I think you are on to something with the batteries though. Probably a bad battery in the bunch.

According to Google support, this is NOT expected, but are aware of multiple reports. They are saying NOT to use the affected smoke detector at this time even with new batteries, and wait for more guidance from another support team. 

Ill be sure to update the post once they get back to me.

I was just wondering if anyone heard any definitive reason this occurs. A bad lithium battery is certainly reasonable. 

Community Member

Not sure if this means anything, but did a no load test on the batteries.

The hot battery read as .42 volts, while all the other batteries read normal at 1.68-1.7 volts

Community Specialist
Community Specialist

Hey Tags68,


Oh no! I'm sorry for the trouble. Could you tell us the case ID from your interaction with our support team so I can take a closer look?


I appreciate the help, eveluna.




Community Member

Case number is 8-2340000033420

Community Member

Just wanted to provide an update.

Out of an abundance of caution, Google is sending a replacement smoke detector, and requested i send back the smoke detector (and I believe the bad battery(s)). 

They believe it may have just been a bad battery, and not with the smoke detector. Their safety team will inspect the old unit, but wont be able to disclose any discoveries, which makes sense.

Kinda wish i could get the official word when complete, but a bad battery makes sense. Ill just beleive that, haha

Community Specialist
Community Specialist

Hi there,

Thanks for giving us an update. We’re glad that our team was able to process your request. As we got our resolution here, I'm going to mark this thread as complete. I'll be locking this thread if we won't hear back from you again in 24 hours. Should that happen, feel free to create a new one if you have more questions or have other concerns in the future. 


Thanks for the help here, @eveluna and @aatienza.