Apple Watch battery life suddenly terrible on iOS beta?

[DoctorFedora]

Just curious if this is happening to anyone else or if it's somehow unique to my situation, but basically ever since installing the iOS beta, I've noticed my Series 4 Apple Watch has had terrible battery life — I used to be able to go from about 10:00 p.m. one day to 8:00 p.m. the next day on a charge, usually with about 20% remaining, but now I'll get the 10% "low battery" warning as early as, in today's case, 3:00 in the afternoon.

Is anyone else experiencing suddenly bad battery life on their Apple Watch when running the iOS beta on the iPhone it's synced to? Or is it just me?

 

[xxFoxtail]

Try rebooting both devices. Maybe the iPhone or Apple Watch are just sending a lot of extra 'garbage' data back and forth and stuck in a weird cycle.

Does it have a cellular plan? Maybe it's just losing its iPhone connection and reverting to cellular, eating away at the battery.

 

[HouseLannister]

It might be unrelated. It also might not actually be a change, since OS updates often recalibrate batteries to refresh the actual, real-world battery life. (i.e. Your watch might have actually shut off at 9% previously because it was actually at 0%, but now 0=0 again.) It could be a bluetooth stack issue, which I had lots of problems with beta 1, but no issues with 2 or 3. If so, they will probably straighten it out in a month or so. It's not watchOS 11 beta, because your series 4 can't run it, so no software issues on the watch itself I imagine.

Open the Settings app on your Apple Watch.
Tap Battery, then tap Battery Health.
If it's under 80%, time for a new battery.

 

[DoctorFedora]

I actually just got the watch's battery replaced earlier this year, though it does say the battery health is already down at 93%. Probably couldn't hurt to do a reboot on both devices though!

 

[P_Watt]

I actually just got the watch's battery replaced earlier this year, though it does say the battery health is already down at 93%. Probably couldn't hurt to do a reboot on both devices though!

I unpaired and set up as a new watch and made a drastic improvement, OS11 still worse than OS10 but gets thru the day now.
I never use the watch on a lower version than the phone, both on beta.