I have 2 DJI batteries, bought at the same time, no more than 20 flights on each. One has stopped communicating with the PT2 app. I get an error that says, Not DJI Intelligent Battery. All lights are lit on the battery, but of course the Phantom won't start, although the gimbal goes thru it's setup. I've tried cleaning the contacts, no difference. Is it possible that the circuit within the battery is dead?