How to Downgrade Iwatch OS10 to )S9
How to downgrade watch OS10 to 9 due to bad battery life and Bad Apps
Question marked as
There is no downgrade.
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.
Change the watch face on your Apple Watch - Apple Support
watchOS 10.2 re-enables left/right watch face swiping
• Open the Settings app on your Apple Watch.
• Scroll down and choose “Clock”.
• Toggle on the “Swipe to Switch Face” setting.
The previous Control Center swipe-up has moved to a quick press and release of the flat oval side button
Use Control Center on Apple Watch - Apple Support
DO NOT hold the button, as that brings up Emergency services and the power off icon.
Control Center should then show you the iPhone ping icon (find my iPhone), Battery percentage, Flashlight, Water Lock, Airplane mode, Alarm silence, Theater mode, and all the other Control Center services.
An alternate way to get some of the Control Center services is:
“Hey Siri, find my iPhone”
“Hey Siri, Flashlight”
“Hey Siri, Battery”
“Hey Siri, Airplane mode”
Closing open Apple Watch apps
Double-press on the Digital Crown -> Quickly scroll to the app you wish to close, and swipe left on the app, then tap the big Red X.
Being quick to scroll the apps and swipe left can be a pain, so disable the following:
Apple Watch -> Settings -> Accessibility -> Auto-Select Focused App -> Off