Hey i have a stock sc10 with the original speed control. Y is it that i can use 6 cell Nimh betteries but when i put in a 7 cell Nimh battery wy does it not work very well. Any thoughts.

What do you mean it does not work very well? It does not go fast? It runs hot? It starts glitching?

It runs slow like it's nt drawing enough power from a fully Charged 7 cell battery