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.

I did the same, but the problem was not fixed:(

Same error. latest WatchOS 10 version battery runtime ca 24 hours. WatchOS 11.0 11 hours. Something seems broken. Apple Watch 8