Thanks guys So wrap the engine in foil after heating with hairdryer for a few mins and wait untill the next day to run my car because my batts arnt going to be charged? (Argh ive waited like half i year so 1 day wont hurt... i have to do things to it anyway like spacers rotostart and decals)
Any more tips?

Oh and anybody just watch top gear? they raced a modified g-wiz remote control version against a hotbodies lightning 10 truggy, then run it over (the lightning) so they ploped in a savage and it won!