I updated the series 3 to the latest version, and now the clock literally went from 100% to completely dead in about 8 hours while I was asleep when, almost before the update two days ago, could go almost two days … I have do not add new apps to it, no additional alerts. Nothing extra running in the background. I haven't even been to the gym for weeks, so I haven't trained with it either. No Problems Before Last Clock Update – 5.3.
I've turned it off and turned it on again, and it still does. I know I can't be the only one with extreme power drains.