I’vE notice an huge battery drain after updating my ultra 1 to watch os 10.1
Yesterday at 00.30 am I had about 65%, this morning at 6 am the watch was off with no battery remaining (only used for sleep tracking with default sleep app)
Charged for 30min and was at 50% now after 5 hours is at 24%
I have the same issue with my series 8. It has a 100% battery health but it drained to 0 in like 6 hours for some reason on 10.1