Doorbell (battery) that was also hardwired went offline randomly one day. Could not resolve so decided to remove and readd the device. Took it off the mount to plug into charging port and reset… it won’t charge. Tried reset button. Tried multiple chargers. It simply will not power on if it’s hard wired or utilizing the charging port. Device appears completely dead out of no where.
There are ongoing complaints in this forum about the warranty page not working.
You could try contacting Google Nest Support to see whether they'll replace it, starting with this link: