The phantom 2 vision fell suddenly from the sky and fortunately fell on a bush. No damaged parts except a propeller. The battery was off, and some grass entered the space where the battery is located. Cleaned up everything. The battery works properly, however when I put it inside the phantom 2 vision there is a very short blip of the led lights at the bottom of the Phantom and after a second or two also the lights of the battery are off. Done this many times, always the same. I have removed the cover of the Phantom: all connections are ok, no loose parts. Please help.