My iPhone 6 battery often died before I was ready to stop flying. So I bought the Anker Ultra Slim Extended Battery Case for iPhone 6/6s. The microUSB port on the battery case transfers the signal from the P3 controller to the iPhone just fine and the battery case charged the phone while I was flying. However, now it stops charging the phone as soon as I plug in the cable from the controller. I'm not sure why the sudden change in behavior unless a controller firmware update or an iOS update changed something. I've tried various cables with no change. Anyone else using an Anker iphone battery case with the P3 Pro/Adv?