It's very surpising, I thought they were gone for a full power-efficiency design. Android watches also have this type of autonomy if not used too much.
It's a limit on how large the battery can be in a watch that's this thin. It's half the size of the Pebble Time's battery, so half the expected run time.
Woah, two days? I missed that in the description. Yep, not going to get one of those at all.
Apparently it fully charges in 15 minutes, which may not be so bad: plug it in whilst in the shower for example. I think it's a bit overpriced for what it is but I guess you're paying for the fact it's thinner and trendier with its round screen.
Two days is an awkward middle ground. It's not long enough to really get used to the fact that you don't have to charge it every day, but it's long enough that sometimes you might forget and end up having it die on you.
Actually, it reaches a day's worth in 15 minutes. If a full charge is two days, that's 50%.
Two days and not waterproof! What's the point? Plus I bet most apps will still display in a square box on the screen for quite some time.