[lincpimp]

You could run a 8xl, 5s a123 is similar to 4s lipo. I would personally go with a pair of trakpower lipos over the a123 cells. The a123 would require a 5s2p configuration if you want the voltage to stay up under load and decent runtimes too. I find that the stick pack sized trakpowers lit better than the a123 cells, maybe that is just me. The 8l is a good motor on 4s plus you are leaving in the 2 speed so that will help with the lower gering at takeoff!