I'm a triathlete. In my long weeks, I train 20 hours per week, and I don't regularly charge my watch. But I never run out of battery. I've never run out of battery. Plus the accuracy is better than any watch I have ever used. In the pool the watch auto laps when I stop at the wall. I love the precision! I am hard on stuff, so the durability has truly impressed me. I left it in my car one evening and the temp dropped to single digits. Watch was cold when I put it on, but worked like a charm. Plus, I can dress it up while I work. The different watch faces are simple, but elegant. Plus I'm a fan of the Suunto App....I love this watch.