THIS is the pack for you. Its a Hyperion 4s 35c 4200mah. I just got one last week, and its great, when I recieved it the pack was in perfect balance and lets me do wheelies in my 15inch wheelbase maxx truggy with a center diff filled with 10,000wt oil. Doesn't get hot or any of that. I get about 17minutes on the race track.