[Hicountry]

I just put 7.2v and Orion 180 core motor in mine. I used venom packs for the HPI micro. 1100 Mah and they work and fit perfectly. I'm an electrician so soldering my own packs is easy. But at twenty bucks a pack it is not worth it. They fit tightly in the chassis. No further fastening needed. As for weight. This thing needs more weight to give it more traction.