A guy at work has one of those. For months I thought it was a blue tooth speaker of some sort. I am on the phone talking at least a couple hours every day and doing various other crap on it, but so far I'm super impressed with the battery life. I doubt I will have to charge it during the workday anytime in the near future. Haven't tried out the video for more than a few seconds at a time just to see what the quality looked like. It's definitely a noticeable improvement from the S4.