I purchased a new 2200 mah battery for my Phantom FC40 that I just purchased and I'm not sure the battery is working correctly. I'm not sure what the 3 red cell lights are for on the charger but when I plug the battery in the charge status light was solid red so I know it was charging. Now it has been in this state for a while where the red light goes from green to red and back. But one of the 3 red lights that says cell 15 is also blinking. What are the cell lights for? The online manual for the FC40 doesn't explain it and I can't find anything on DJI's website that explains what these cell lights are suppose to be doing. Anyone know what the lights mean? Is this new battery bad?