Are you sure? I have the same set up (two extra cells) and the car still has reverse and everything. No fried electronics, either. and about beating a micro RS4, there's no way
. I have a micro RS4 with a pan chassis and a 380 motor , 7.2 V battery pack, and the thing is ridiculously fast. but it might be able to beat a stock micro RS4 if thats what you were talking about......