I don't know if it's because I tend to track hour-long workouts, but I loose battery life pretty quickly. I work out in the morning, and often, by 11, I'm at 75%. Compare that to my phone, which stays in the 90s. Is that normal for a the watch? Any tips on keeping it at 80% or above until, say, 1 PM? I start wearing my watch around 7:30 AM and keep it on until 10. I have a 38 mm stainless.