At the end of my work day I used to have between 45-65% battery left and was always very impressed with battery life. I've owned the watch since it first was available. Yesterday when I got home I noticed I had 10% life left. I thought it was weird but didn't think much of it. Today after wearing it for 3 hours I was down to 70%. I erased the watch, re-paired it with my phone and 3 hours later I'm now down to 26% and haven't done anything different today or yesterday compared to all of the other days I wear it. I'm debating if I should make a genius bar appt and try to get a new watch.