i really have to stick with the 4s, we where doing 10min racing, but now changed to 20min... im easy with the throttle, in a 38sec lap i only use 7sec of full throttle, the rest are corners, small jumps an a big jump that doesnt require a lot ( i use a 17 pinion )... also a BEC,a transponder and a high speed/torque servo.. i dont know if that takes too much amps..., the rest is standard 2200kv, standard esc.

As i was browsing i saw that at maxamps.com they have this 6500 4s lipo that is supposed to last 26min... anyone had any experience with it??... if anything works ill go with the 11000mAh 4s 40C !! , i think ill reach the 20 min with that!!