iPhone 15 Pro Max & a Series 7 watch. I reset my watch. Nothing. Still had crazy battery drain. Dead in under 2 hours. All third party apps removed. I then downloaded the public beta 10.2 update almost 2 weeks ago I believe and my watch is back to its normal self. I toggled off the beta update option in settings after as I didn’t want that to be regular thing.

Mine is much worse and it was already bad last update.