Nest Topaz-2.7

SaferProducts.gov consumer incident report 20180525-2A4B0-2147387734. Matched catalog product: Nest Topaz-2.7. Source model text: Nest Protect - Topaz-2.7. Incident: We have (2) Nest Protect products, one upstairs and one downstairs that are smoke and co2 alarms. Both were purchase at different times and one is 3 months old. Our stovetop is a glass stovetop with touch controls. The cat stood on it and turn on a burned to high that had a silicone hot plate on it and a bread knife with a wooden handle. My wife and I were outside when the cat did this. We came in the house and it was filled with smoke throughout. Neither of the 2 Nest Protects detected smoke nor were alarming. If we hadn't come in when we did, the whole house could have burned down.

SaferProducts.gov consumer incident report 20231115-526A6-2147343997. Severity: Incident, No Injury. Product: Nest Topaz-2.7 (Nest Protect Gen 2, Smoke and CO2 Alarm, Battery Powered, see 2nd Gen on this page: https://support.google.com/googlenest/answer/9232605?hl=en). Incident: Google Nest Protect Gen 2 Smoke/Carbon Monoxide alarm battery overheating. Second time this has happened in my Nest Protects, I have 7 of them. November 2022 issue: Nest Protect reported no issues in regular testing since installed in 2019. Suddenly, it loudly chirped and the app popped up with a low battery warning. I popped it off the ceiling and opened up the battery compartment to swap the batteries and was greeted by the faint smell of what I can only describe as hot plastic/burning rubber. I pulled the batteries out and one of them was BURNING hot. Like boiling water hot - could barely touch it. Battery took hours to cool down outside. Google replaced the device through their safety program. November 2023 issue: Same exact issue, different device. Contacted Nest and am awaiting contact from the safety team again. I used a thermal camera and the hot battery, an [REDACTED] Ultimate Lithium AA battery, was around 150 degrees. Other batteries in the device and the other 6 devices I checked as a precaution were only 70 degrees. Extremely concerning since this is a fire detection device and this could have the potential to cause a fire if the battery got hot enough. After having this happen twice to me and seeing many reports on Google Nest's forum, I felt it appropriate to report to CPSC. See this page for lots of similar reports through the forums: [REDACTED]