The Kokam's are really the only cell you want to use in either, I think it has a built in cut off device? You need one either built in or inline to run lipo with the Novak safely. The 6s draws a lot of amps as well so don't cheap out on lipo's otherwise you risk damaging them. Word has it 2s lipo is about the same power as 7 nimh due to less voltage drop, less weight etc.