Hi
Battery life varies depending on use and other factors.
In tests, for example, Apple achieved 18 hours of battery life with the following usage: 90 time checks, 90 notifications, 45 minutes of app use and a 30-minute workout with music playback from Apple Watch via Bluetooth.
Other examples are detailed here:
http://www.apple.com/watch/battery.html
If your watch is experiencing significantly shorter battery life than Apple's examples suggest that you should expect, try the following steps:
If you have not yet done so, update your iPhone and Apple Watch to the latest software, starting with your iPhone:
Close all open apps on your iPhone and then restart both your iPhone and your watch:
- On your iPhone: double-click the Home button, then swipe up on each app preview to close it;
- Turn both devices off together, then restart your iPhone first;
Unpair and re-pair your watch:
Under previous software versions, some users reported experiencing 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 watch experiences significantly shorter battery life than Apple's examples suggest that you should expect, I suggest contacting Apple Support or make a Genius Bar reservation for assistance: