A question for all who have posted your battery issue here: Have you told your story outside of this limited venue? I'm not a Facebook, X, Instagram or other social media user, but I'll bet a lot of you are. So far there are 8 pages of complaints and observations here, but it seems we're "preaching to the choir." Everyone here already has an Apple watch. Posting problems like this elsewhere will serve as a warning to those who don't have one but might be considering one as a gift. If you read that there is a charging problem that has been unsolved for months and months, you might think twice about buying one. What's more, the Apple execs looking for their annual million-dollar bonuses might decide this really needs to be fixed. Just my thoughts.
BTW, the history I've seen is version 11.0 must have had bugs. Version 11.01 may have fixed them but introduced a battery charge problem. Version 11.1 was intended to fix it and did for some but not others. Now I'm on 11.2, and while a full charge seems to bounce back and forth between 80% and 100%, daily charge is lasting through the day, typically 7am to 11pm. Notes. I have Passcode turned off (and btw, the watch is way less trouble without passcode for me). I've also turned off most apps that I never use. I do an "indoor workout" (1 hour on the treadmill) pretty much every day, and I use the watch to find my iPhone once or twice a day, and I use the timer maybe every other day. Battery "health" for my series 6 is 93%, and the Last Charge was to the Optimized Limit of 80%.