That's definitely a 14-20V motor for general use. I have two in my crawler running 2s LiPo and it is slooooooww but very torquey (sp?). I've almost ripped the tires out of the beadlocks a few times...
Yeah too many Nixx cells gets heavy, I had my Rustler running 14 cells at one point- I think it weight almost 10 pounds, though it still went like hell with the Lehner XL2800.
