Google Nest on Twitter: "@AliDav Understood, it's actually important that the Nest Protect only uses those particular batteries as any other types can even damage its sensors. Here's a link that will
How to Replace a Smoke Detector with the Google Nest Protect - Mother Daughter Projects
Nest Protect Teardown - SparkFun Learn
How to Replace a Smoke Detector with the Google Nest Protect - Mother Daughter Projects
Replace Nest Protect's batteries - Google Nest Help