RE: Drove the wheels off it! Need new wheels!
I am not entirely sure that they will fit. Reason being that the B4 rear wheels run off of a straight pin, the redcat however uses a 12mm hex. However if you remove the hex and the pin is the same size, you may be able to do it.
Btw, there really is no need to discharge the LiPo and discharging it too far may actually hurt it.