Tamiya TamTech Countach w/battires

Hello I have a Tamiya TamTech Lamborghini Countach LP500S. it comes with 3 batteries only 2 of them work An official TamTech battery 7.2V 500mha and another 3.7V both of those batteries work just the one with the lower voltage doesn’t deliver as much power in other words the car is slower with a smaller battery Also 2 chargers, the official charger for the first battery and another charger for the second battery. I tried charging the second battery with the official charger once and it kind of melted the original charger and the original charger. They heat up badly and smell caution, if using the original charger. The controller is flawless. The car has bunch of micro scratches at the back of the roof no inserted driver but the car works flawlessly apart from some scratches that are just cosmetic The car normally does not come with batteries when new and the batteries usually are expensive when you find them so this comes with 2 good working batteries but to be honest, I can’t vouch for the charger. It works, but it heats up a lot and smells use at your own risk with the charger. Open to offers