So I've had a Fitbit Surge which I sold because I had to keep taking it off to charge (as it tracked my sleep during the night) I then got an AW1 which I thought was kind of cool and I coped with the charging aspect of it (charged it next to my bed) but in the end sold it as I didn't feel I was getting too much benefit from it. And now I'm thinking of an AW2 because there are a couple of important differences for me: GPS - I cycle commute 25 miles a day and at weekends I'm often out riding 100 - 200 miles a day; water proof - I also swim quite a lot. So the questions: Apple state a battery life of 18 hours, how much is this reduced by using GPS (a 200 mile bike ride will take, including food stops etc, around 15 hours) so an 18 hour battery life is borderline. I currently have a Kahuna sports watch for sea swimming and it gets fairly salted up but still works. Anyone got experience of the AW2 swimming in the sea, negative effects or not?