re lipo batteries
maxx amps 3s 5000 lipo is a good choice. to get a longer runtime you could have went with a maxx amps 3s 8000 lipo.
with the neu motor and the mamba monster max esc you can run more voltage if you want to. if you want some insane speeds kick it up a notch and run a 6s lipo. you would have to adjust your gearing though.