so I had an Apple Watch S2 and returned it because I could justify the price for what I was using it for. I just got a series 1 at a great price to go along with my AirPods. The battery life on the S2 was amazing- I was getting more that 20 hours. But the series 1 sucks. I have been wearing my watch with less than normal usage for 7-8 hours and my battery life is at 38%. Any suggestions of how to get battery life back to normal?