Hi guys I have an M5. One battery works well and charges when plugged in. Goes from all red lights to green when fully charged. The other battery when plugged into Movi does nothing. No green lights turn on at all. When I plug it in to the charger - I use 3A and LiPo setting. But ONLY the 3S red light comes on. Not the 4 like with the other battery. Is there any reason for this? Is this normal and just needs a long charge? I haven't changed the polarity/incorrectly plugged anything. No extreme weather conditions as far as I can tell either. Any way to get this battery up and running again? Thank you.