My Galaxy Watch is only 3 months old and I recently noticed that since the One UI update my battery only just lasted the day maybe 20% (battery manager said 1 day on a full charge), where as before it would have still been 80-85% after a full days use (with the battery manager saying it would last 2.5 days on a full charge).
But I read that backing up your watch and factory resetting may solve the problem, so I went ahead with it this morning, and the good news is that it seems to have worked! It went a full day 0800-2300 with 85% remaining!! And the battery manager now saying it would last 2.5 days on a full charge.
Give it a go! I have noticed that people have had mixed results, but it definitely worked in my case.
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