I was out today and tried an experiment I have suspected that when running videos most of the time 15 minutes is about as safe as I can get on a new battery.
Next battery flew for 35 minutes taking about half dozen photos at about 400 feet out and 200 feet up.
The third battery I flew fast and high taking a few videos and photos and got a low battery at 400 feet up and barely got it down in time, 20 minutes.
Bottom line you have to pay attention to"everything" when you fly, weather, wind, taking videos, flying fast and climbing fast. I have two DJI Phantoms
and they will fly circles around these Yuneec's, the Yuneec's are very slow in response time. Do love the camera that takes fantastic videos in 4K though.
Will have more insights later, Alan