I have an AW5, and the latest update caused excess battery drain for one day. And it’s been back to normal since. 85% battery life.
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I can add my wife's latest Series 9 was partially affected but appears fine for now, also I have read a lot of other user's some of which have the Ultra who are affected. It doesn't seem to be everybody but it sure is a lot of people and models. I do not want to test it on my other older watch models and mess those up (not all can be updated to this version but anyhow).
I got the latest update just last week and my charge now only lasts for 3-4 hours utmost vs almost a day before :/
Yeah, it’s wild! The 2 main causes I’ve seen are either a random 3rd party app, or if the iPhone isn’t on iOS. Seems like pretty obvious things you would test in QA.
Fortunately I had my S4 set NOT to auto-update, so I’m holding off now until a fix is released!