I have two TB47s and two TB48s. For some reason I'm unable to top up the charge on both my TB47s. They're both sitting at about 80% charge, due to removing them before finishing their charge earlier today. When I put either of them back on the DJI charger (not the multi hub as haven't got one), nothing happens. No LED lights come on to say they're charging. I can push the button on both to get the battery level and they'll have three LEDs on with the fourth flashing (indicating level 75-87.5%). But when I plug in the charger connector nothing happens. Why is this happening? It's not the charger as it works fine on the other batteries. I get same problem with car charger. I'm really confused.