At the moment the battery life is just a rumour, but even if true, the Watch will not be used every second of every day. We don't walk around constantly looking at our watches. I don't mind charging at night time it's when i charge my phone anyway, i don't need my devices when i'm asleep. Let's just see whathave for us first, after all there are a few things that are still secret.
Its not a rumor. You know the size of the thing, so unless its star trek hour battery life will suck balls.