Apple Watch Series 9 battery drains rapidly after updating to watchOS 11.5

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RcktGrl Author

Level 1

6 points

Apple Watch Series 9 battery drains rapidly after updating to watchOS 11.5

The only difference between last night and the previous month of sleeping wearing my watch was the WatchOS update.

I charge watch fully before bed. Then recharge late in the evening with about 30% remaining
Last night I updated to the latest WatchOS: 11.5 on a Series 9.
Woke to 40% battery remaining.
No other behavior or settings changed.

This is really a bad drain on the watch battery. It should not be happening.

[Re-Titled by Moderator]

Posted on May 14, 2025 12:03 PM

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Answer 1

Top-ranking reply

BobHarris

Level 9

57,185 points

May 14, 2025 12:51 PM in response to RcktGrl

It will take 24-48 hours for the new operating system to finish it house keeping, as well as resync things it wants from the iPhone. Power cycle the Apple Watch and your iPhone (at least once, but maybe once or twice a day until the Apple Watch battery consumption returns to normal. The MacObserver.com How To Fix WatchOS 10.3 Battery Drain Issue on Apple Watch https://www.macobserver.com/tips/how-to/fix-apple-watch-battery-drain-issue-after-watchos-10-3-update/ Also see: https://discussions.apple.com/docs/DOC-250007078 For some steps that are not in the MacObserver article. iPhone -> "Watch" app -> General -> Reset -> Reset Sync Data Again it may take a day or two for the rsync'ing of data to settle down. As a point of reference, my Apple Watch Series 4 with 90% battery health maximum capacity, was back to normal after 24 hours (watchOS 10.5). I did 1 mid-day recharge, and I power cycled my Apple Watch and iPhone twice.

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