Go to the Recommended Answer.
Energizer Ultimate Lithium “L91” AA would be the recommended ones for replacement.
Hope that helps!
View Recommended Answer in original post
I just wanted to reach out and see if you still have any questions about the Protect or the batteries? Please let me know if I can be of any help from here.
It looks like we haven't heard back from the OP so I'm going to go ahead and lock the thread. If you have any further questions or concerns, feel free to create a new thread.
Have a great day,
Google Nest Help Center
Chromecast Help Center