just dont go above 6 cells 7 if your risky and have some money to burn and always remember to use nimh or nicd better discharge rate
![](http://www.xmodsource.com/forum/images/smilies/icon_biggrin.gif)
and bearings.
ORRRRRR if you really wanna go fast (and i mean unimaginable blinding speeds) get a v2 board and like 5 lithium cells your xmod should literally go faster than a car