WatchOS 10.1 battery drain issue - Apple Support Communities
2023/11/03 ... This happens when one of your apps isn't up to date for watchOS 10.1. The app is causing the battery drain.
https://discussions.apple.com/thread/255241541Apple Watch battery drain after Update
I noticed my Apple Watch battery draining very quickly after updating it to 9.5.1. Anyone else? My battery usually lasts 2 days. [Re-Titled by Moderator].
https://discussions.apple.com/thread/254905000Battery Indicator Incorrect on Series 5 Apple Watch
When the battery charge indicator reaches approximately 15-33%, the watch powers down suddenly, with no low battery warning (which should be given at 10%).
https://discussions.apple.com/thread/251191371My Apple Watch battery dies in under 10 hours since the last update.
2022/05/26 ... As the OP stated, and as in my case, the battery life drop off has been from 24+ hrs down to around 8hrs solely after the update to watchos 8.6.
https://discussions.apple.com/thread/253914228Iwatch battery issue from 100 to 10 in 30… - Apple Support Communities
2021/01/21 ... Twice this last month, I have fully charged my watch the night before and then went out for a walk listening to a podcast.
https://discussions.apple.com/thread/252339946Apple Watch battery lasting around 10 hours – is this normal?
2020/02/16 ... The battery is not always remaining charged for a full day as it was when I was on holiday - The past couple of days it has lasted about nine or 10 hours.
https://discussions.apple.com/thread/251119897「BatteryPhone」をApp Storeで
... watchでphoneとwatchのバッテリー状態を確認できます。 コンプ ... 具体的には、外側の円と内側の数字をapple watch のバッテリー残量、外側の小さな数字 ...
https://apps.apple.com/jp/app/batteryphone/id1191334332