I don't know. I bought the original large battery with the external charger. Later, when supplies went south, I bought the original battery and battery door. I sent one of the chargers back. They refunded me. So, I ordered another one. This time, I bought the original, larger battery and charger.
The problem I have had with the external chargers has been the latching mechanism. My original locks the battery and the pilot light comes on. The other one does not latch. Another battery charger latched but the pilot light kept going out.
So, here are two shots of the warped battery. Help me out. Does this battery show signs of overheating? Or, is it possible that a drop might have caused the problem. I have dropped this radio several times, but not that many when compared with the 436HP.