If it's a day or two of battery life and it gets a full charge after a half hour or even 15 minutes, that's very acceptable to me.
For example, if it's basically the time it'd take me to take a shower and put clothes on in the morning to get back to a full charge - that's aces. At that point it almost doesn't matter if it lasts 2+ days.
I guess this is the same we'll all get used to pulling out "smart-watches" in to charge every two days..
Apple's usually be one of the best with battery life, but they struggle over iWatch, a small device.
Good thing is, the only difference is here not alone. Even Samsung only has a mere two day or so cycle.
Everyone needs to stat somewhere, but the upshot is, they can't be any "bashing" about it yet about poor battery life, since they'll all in the same boat.
Although you could laugh at the face every manufacture who has a smart watch out needs to connect to a dock and charge, i can probably see this alone a trade off by most people, since how we currently use non-smart watches now, we don't take them off to charge, there is no need to. And it lasts a hell of a lot longer than 2 days.
Until Apple, or some other manufacture, break the battery barrier, it will probably have a limited selling range.
Who wouldn't want better battery ? and 2 days is totally unacceptable, since its designed to be wearable all the time is it not ? Isn't Apple marketing this as a 'wearable' device ? Its not wearable if you need to take it off, or need to plug it in via cable. I agree. wireless charging is the only way out here, (without any cable), but Apple would need to tread carefully to still maximize battery life.... They can do it... they'd done it in the Mac's history reports.... They can do it here, before anyone else.