after undate to watchOS 26 have poor battery life
After updating to WatchOS 26 my battery draining faster
Apple Watch Series 7
Question marked as
If force restarting the watch and the iPhone does not help, erasing and pairing the watch again would be the next step.
Force restart iPhone - Apple Support
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.
Unpair and erase your Apple Watch - Apple Support
It might also be, that apps like Podcasts, Music or Photos, for example, are still syncing data between the iPhone and Apple Watch.