Hi
Battery life varies depending on use and other factors. Examples are detailed here:
Apple Watch - Battery - Apple
Apple's tips for maximising battery life on Apple Watch are detailed here:
Batteries - Maximizing Performance - Apple
It may help to follow these steps, which have previously resolved battery life issues for other users (check after each):
If you have not yet done so, update your iPhone and Apple Watch to the latest software, starting with your iPhone (be sure to make a backup first):
Restart both your iPhone and your Apple Watch, turning both off together and then restarting your iPhone first:
If you have ever (not necessarily recently) previously used the Workout app and/or any third-party fitness or sleep tracking apps to record workouts on your watch, check on your watch to see whether there is a paused activity within any of them. If there is, end that activity from within the app on your watch (not your iPhone).
- If in doubt, remove any such third-party apps from your Apple Watch.
Unpair and re-pair your Apple Watch:
Some users have previously experienced battery life issues in connection with using corporate profiles and/or Exchange Calendars. If you are using an Exchange Calendar, one or more of these steps may help:
- Archive your Exchange Calendar for all items before today.
- Remove / delete all old inbox messages relating to calendar invites (accept and decline notifications).
- Create a rule in your Outlook Mail account that moves all future accept and decline replies, immediately upon receipt, into a separate mail folder that does not sync with your iPhone and Apple Watch.
- Check your Exchange Calendar for errors.
Finally, it may help to:
- Remove third-party apps from the Dock and/or from your watch and then monitor battery performance after adding them back, one at a time:
- Remove watch face complications and monitor battery performance as you add them back:
Having tried the previous steps, if your remain concerned that battery life is shorter than it should be, then I suggest contacting Apple Support (remote diagnostics and/or mail-in service may be available, if required), making a Genius Bar reservation or visiting an Apple Authorised Service Provider for assistance, including - if recommended - to have your Apple Watch inspected and serviced:
Apple Watch Service Answer Center - Apple Support