I was curious too about the battery life and then pleasantly surprised.
"When asked about battery life, reps told me that it should last 36 hours in always-on state, and even longer if you opt to turn the screen off -- there's a companion app that you can download onto your Android device, and it gives you a few settings."
I have a Pebble and it lasts several days (whenever I go on holiday, I don't bring the charger) and yet because it is another device I find myself charging it daily anyway. I plug my phone in, my tablet in, and then my watch in every night.
The difference with a watch is that I don't really want to take it off my wrist all the time just for charging. If there was some kind of wireless charging mechanism then I'd happily wear one. And I'm not talking about the wireless charging pads where you still have to take the watch off to charge -- we need something that can charge the watch just by being inside the room or house.
Perhaps inductive charging can make this process less annoying - an inductive charge-plate on the nightstand, dump all your gadgets there without plugging anything in.
Earlier rumors were that the Moto 360 will use Qi charging. Qi still usually requires per-device charging positions and semi-precise placement to work, though. It's just a "just dump it in this general direction" technology, unfortunately.
"When asked about battery life, reps told me that it should last 36 hours in always-on state, and even longer if you opt to turn the screen off -- there's a companion app that you can download onto your Android device, and it gives you a few settings."
From http://www.engadget.com/2014/06/25/lg-g-watch-hands-on/