I was just using my new (two weeks old) auto battery and I accidentally dropped it. We're talking maybe a two foot drop, and onto carpet, but for some reason now I can't get it to work. Puffing on it does nothing, either with a cart on or off - the LED doesn't light up or anything. I tried plugging it into the USB charger and the LED went apes*** blinking a ton of times, but since it was just fully charged up an hour ago it won't charge any more. Any idea what happened?