I have a P4P that I recently replaced the battery of the controller. It charged ok and I have used it a few times. Checking it yesterday the battery was down to 3 lights. I put it on the charger and it would only charge up to 3 lights with 4th one blinking. I waiter awhile and put it back on the charger to get all 4 lights and just left it there till it turned itself off. I checked and it was back to 3 lights. I waited to make sure it was not to warm and put it on again. When I checked again it was down to 2 lights. I am afraid to put it back on the charger again. Does anyone know what is happening?