You can use a small silicon voltage regulator. I don't think this would work fowards and backwards, though.

Whoa! I think I just traveled back in time! I anwered Keuseman's post before he posted it!

Makeing them go faster
 

I got a good idea one day.

I was thinking that if you put a trasformer in the right place in the char-g it would increass the voltage and make the motor run faster.

I was thinking of just putting it right befor the motor, so you dont fry the circutboard.

Plz give me some info on this.

:D :)

hmm youd generate a lot of heat and ad a ton of weight and your battery life would last about 3 seconds.