Here is a pic of my charger. I left the stock charger on my controler alone. The dual cell charger is made from a base from a microsizer controller wired directly to an old 4.5v power adapter from a Sony CD player I used to have. It works great. I simply plug the car onto the base and leave it until I begin to feel the batts get warm and its done.
I did the dual cell mod just as it is on
QFM Racing's site My camera stinks at taking really close pics so I have none of the insides of the car.
I hope this helps ya out.