Apple Watch battery draining fast after 26.2 update

Did you already try to force restart your Apple Watch after the latest update?

To force restart your watch, press and hold the Digital Crown and the Side button together for about 10sec, until the Apple logo comes back again.

If this does not help, unpairing and pairing the Apple Watch again has helped other users.

Unpair and erase your Apple Watch - Apple Support

Also have a look at the posts in this discussion:

Apple Watch battery draining fast - Apple Community

You should let Apple know directly about this issue by using the Feedback link, as this is the only way to reach them.

Feedback - Apple Watch - Apple

The watch will use more battery life for a short period of time after the watchOS update, especially if there is some background syncing involved, for example podcasts, music, photos, etc.

Brklyn-Gal wrote:

... draining way too fast ... Interestingly, I just received this device today, upgraded from older device. Also, I have always turned off features that are known to affect battery life.

You indicated you have a Series 11 watch, so do I. I am pleased with the battery on mine, Apple advertises "up to 24 hours in normal use." I can have one or two workouts in a day, plus nighttime sleep tracking, and scores of notifications for emails, texts, news headlines and the like ... and mine seems to last in normal use 24-30 hours. Overnight sleep tracking uses up about 20% (+/- 10% not sure why it varies sometimes).

By what measure do you believe yours is draining too fast? Some older watches might have lasted longer (with fewer features).

You're welcome, all the best! 🙂