Since yesterday my AW has gone through my battery harder than normal after normal usage. I just got done talking to Apple Care who ran a diagnostic on the watch and battery and they said all is well. I also looked for an app in the app store that tells me my battery health is at 89%. The advisor said my watch was running through my battery harder because I have not rebooted my watch in weeks. So my advice for people here is to reboot your AW at least once a week to avoid the problem I had.