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
Apple's tips for maximising battery life on Apple Watch are detailed here:
http://www.apple.com/batteries/maximizing-performance/#watchtips
If your watch is experiencing significantly shorter battery life than Apple's examples suggest that you should expect, try the following steps, which have helped to resolve battery life issues for some users (including after updates, when usage patterns have not changed):
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, making a Genius Bar reservation or visiting an Apple Authorised Service Provider for assistance, including - if recommended - to have your watch inspected and serviced / replaced under warranty:
Apple Watch Service Answer Center - Apple Support