ATJ
Contributor
I typically only have to charge my Mk1 for about an hour twice per week, usually Monday after a weekend of diving and Friday after a week of running/walking/daily activities and so it is ready for diving on the weekend.That also means you are putting more battery cycles on your dive computer's rechargeable battery, and using it throughout the day lowering the battery available for diving.
I've had the current device for 22 months (my first one was replaced when one of the buttons failed). That's close to 100 battery cycles with no noticeable degradation in battery life.
The other thing I should have added is that I like to count my steps with a goal of doing 10,000 per day. Before I got my Mk1 I had a separate activity tracker/sports watch. I couldn't take it diving and so would "lose" up to 2,000 steps for many of my shore dives. Having the Mk1 do that for me means I get a more representative count. I'm not suggesting everyone cares about this sort of thing, but for those that do, the Mk1 (and Mk2 when released) is a big advantage.