Apple Watch Ultra 3 battery drains from 100% to 0 in less than 5 hours during sleep

Fully charged my Apple Watch Ultra 3, just purchased, before bed at 9:30. Wake up at. 2:30. The watch is totally drained.


[Re-Titled by Moderator]

Original Title: Apple Ultra 3 battery drain from 100% to 0 in less than 5 hours while I’m sleeping. What gives?

Posted on Nov 2, 2025 12:57 AM

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Posted on Nov 2, 2025 3:02 AM

Unpairing and setting the watch up as a new device, without using the latest backup would be the way to rule out defective software, causing the drain.

Unpair and erase your Apple Watch - Apple Support


If this does not help, you should get the watch diagnosed, which the Apple Support can do online:

Contact Apple Support - Apple Support

1 reply
Question marked as Top-ranking reply

Nov 2, 2025 3:02 AM in response to Paul D Yu

Unpairing and setting the watch up as a new device, without using the latest backup would be the way to rule out defective software, causing the drain.

Unpair and erase your Apple Watch - Apple Support


If this does not help, you should get the watch diagnosed, which the Apple Support can do online:

Contact Apple Support - Apple Support

Apple Watch Ultra 3 battery drains from 100% to 0 in less than 5 hours during sleep

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