[MetalMan]

That's what I meant (guess it wasn't clear enough). But 2 2s packs per side, to make a 4s pack per side. And since there are 2 motors to handle the load, the individual work load should be lessened, therefore giving the Lipos a bit of a break. Also, the difference between the weight of 28 cells and 2 4s Lipo packs is just amazing! ~1750g for the NiMh's, and ~800g for the Lipos. Of course you have to pay though; $328 (without discounts) for the Lipos from Tower Hobbies, and ~$140 for 28 GP300 cells.