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%
Same here, although not as drastic. Lost around 30% in the last 6 hours on my S7