I’m having similar issue with my Doorbell 1 with solar sleeve. Battery drains fast since January. Solar statsus on App says “add a solar…”.
I contacted Support twice. What a painful experience. They put me through the script of resetting doorbell and having me go through set up again. No answer to why the “Solar status” in the app wasn’t saying I had solar connected. I asked them if they could tell the Solar was even working, they had me trigger an event and they said that it was working. I asked if there was a way I could tell and they said no, but they could tell from their end. Fully charged the battery and It’s been 2 days and battery is at 85%. It’s been sunny both days too and temperature in the 60’s.