you would need to run two 7.4 lipo packs(2s) and as far as capacity it depends on what you want to spend, dont forget a lipo charger and balancer, the rc monster store will have everything you need and if you dont see it you can email mike(owner) and he can help set you up, btw i have two maxamps and they are 5000mah and i get about 20-30 of bashin if im easy on the throttle(hvmaxx 4.5 system in my revo)