I've noticed that when I have my GoPro 4 operating on my Phantom 2 V+ (with the QR setup and Zenmuse gimbal), that the USB connector appears to be supplying power to my GoPro4 camera. If the camera is on, I see it powering the cam on my Iphone screen. If the camera is off, and the Phantom is on, the charging light goes on the GP4. Is everyone seeing this? I assume so, but it does mean that the Phantom will not fly as long if its supplying the video camera and the phantom itself, right? Guess I only need one battery for my dedicated GoPro for my quad.