Thanks for the help Blind
It sounds like I may need to test out those 1200 cells. I'm looking at another 7 cell for my RC18.
Bummer those Li-Ions are only 750 mah , I was looking for something a little bigger. Thanks for the 6 V tip. I've wired in the Novak voltage regulator and have at least 6 tanks thru them. I topped off my 1500 2 cell Kokam pack, and everything runs great. I'm just searching for something thats a little smaller, but with the same or higher mah.