WatchOS 7.3 affecting battery life and functionality

To understand Apple Watch performance and its relation to your battery, see:

Apple Watch - Battery - Apple

Apple Watch Battery and Performance - Apple Support

“Battery life” is the amount of time your device runs before it needs to be recharged. “Battery lifespan” is the amount of time your battery lasts until it needs to be replaced. Maximize both and you’ll get the most out of your Apple devices, no matter which ones you own. See the "Tips for Apple Watch" section in:

Batteries - Maximizing Performance - Apple

If the battery drains too fast after an update, see all the replies to:

Update 6.2.1 Battery Draining Too Quickly… - Apple Community

I found something could be help someone meet problem with apple watch battery life in w.os: 7.4.

i have apple watch s4/44/nike version. I have tried so many way to fix error battery life is too short: change battery, re-pair with backup/new one. So i found that problem yesterday. In w.os 7.xx, after paired, a.w with sync every old data of devices which exist in health up. That is reason why battery was run out quickly. (You can found in health app -> profile-> device). So this way which workd to me:

1, up pair your apple watch

2, remove A.W on icloud

3, remove A.W in Bluetooth setting (if available)

4, remove every device which avalable in health app (exclude your iphone)

5, reset ip & A.W

6, pair as a new A.W.

that all i tried and now my A.W working properly.

i hope it could be help.