[RC-Monster Mike]

I use the Kokam Lipos. I got mine from Tower Hobbies and Horizon hobbies. My dealer price doesn't justify trying to sell them, as they are about the same as Tower or Horizon after member discounts. I use two 2s packs, wired in series (same wiring as the nimh setup). There are some other packs out there that will deliver a longer runtime, but none that deliver the punch per oz as the Kokams.