Same error. latest WatchOS 10 version battery runtime ca 24 hours. WatchOS 11.0 11 hours. Something seems broken.
Apple Watch 8
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I did the same, but the problem was not fixed:(
I have the same problem on all HomePods (Minis).
I deleted the beta profile after 15.0, but the profiles has been re-installed automatic. So i have now 15.1 on the HomePods.