Let me preface this with a disclaimer: I had updated my Apple Watch Sport to WatchOS 2 GM before it went public (and before that "breaking bug" was found by Apple). I had checked my Apple Watch for updates yesterday and noticed WatchOS 2 officially launched. I placed it on the charger, updated overnight and went to work the next day (TODAY) Usually, the watch lasts my whole work day. Today I was not so lucky... By 10AM, it's usually at 98-99% Today it was 90%. Weird By 12PM, it's usually at 90-95% Today it was 50%. A bit troubling. By 1:20PM, it's usually at 80-85%. Today it was 10%?! I was perplexed. I NEVER had this bad battery life using the WatchOS 2 GM, or even with 1.0.1. Yet when I updated to the official release, the next day during minor use, battery life dropped LIKE A ROCK. WTF happened here? I at least have AppleCare for my watch. We'll see tomorrow when I go back to work, same conditions, to see if it's not a fluke.