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.
Send an email to Tim Cook. I’ve had some success with this path. His email is publicly available elsewhere and he has a team that responds to issues.