[Jshwaa]

Voltage isn't the most important component in making a more powerful xmod, mAh is. The truth is 9V batteries have 6 tiny cells in series inside them. Each of these cells have a relatively small mAh rating. Getting 9V out of such a small and light package might seem ideal, but you are starving your motor of the key component it needs to produce its electromechanical force.....CURRENT. 9V batteries are good for small electronics which need audio amplification, but for driving motors they are the worst choice.