Originally Posted by AAngel

The big deal with lipo is really the increased voltage of the packs, it is more the increased voltage under load. Even the best nimh cells drop significant voltage when hit with a load much over 35A. Yes, they might be able to hold around 1.1v per cell at around a 100A draw, but will drop voltage significantly after about 10 seconds.

A good lipo cell will hold 3.5v under a 100A load. I know it's comparing apples and oranges, but in the end, the lipo will be better. You should also see a good boost in overall performance over the charge of the battery pack.

I have run a couple of my MMs on 5S. They do OK, but I'd stick with 4S. The MMs will very comfortably handle 4S.