So I got my 360 Friday. Saturday was the first full day. Took it off the charger at about 9:30am. Used it pretty heavily trying to get used to it. At 8:30pm watch battery was at 3%. Today, took watch off charger about 9:30am. Used it more moderately and more like a normal day will go. Battery here at 8:49pm is at 54%. So like any device, usage is the key. I have no doubt I'll get a full day's usage out of the device.