Thanks so much for these instructions. Here is the battery I used, and it fixed the problem I was having with the door bell rebooting.

Nest Hello Doorbell (Wired, Gen 1) Replacement Battery: Battery Replacement for Nest Hello Vido Doorbell Wired NC5100US C1241290 1ICP7/17/26 (280mAh/3.7V)

https://a.co/d/0uQbtTA