what they said is right. If you are running nimh, even 2 nimh in series, lipo is still better. I run my min e-revo on 2 2 cells in paralell, and it is almost uncontrolable.... I cannot imagine, nor do I even want to try 3 cell lipo..... its hard enough to keep it upriight on 2 cells.... Beofr I went lipo, I used two nimh in series... it would wheely and was fast. Going to 2 cell lipo turned it into an insaine beast.... I had to buy a wheely bar to have any holpe of keeping it upright, and its still crazy.... Its just oo much, I am converting it to a mini summit....