Before the last update my battery would easily last all day and night. I’d even have enough to keep it going until the afternoon. Since updating last night to watchOS 10.1.1, the battery on my Series 8 has been awful. I’ve not used GPS or cellular and had my phone with me all day. Anyone else had this issue? I know I only charged it to 88% this morning but I can’t remember the last time I had to top it up in the evening before a workout.
This made a big difference for me - a pain to reset FaceID but worth it to get battery life back (note have not tried this for 10.1.1): Weather Complication fix and why I don’t think it’s the battery drain. : AppleWatch (reddit.com)