If you want bigger lipos to have more run time, one option you have is take the money you would spend on that chassis and get a couple more sets of nanotech lipos from Hobby King. Lipos that have the right dimensions to fit the stock chassis. Right now, the best chassis you can run on this truck is the stock one. Bigger lipos are heavier, the E-Revo was designed to run with lipos that fit in the battery compartments. The E-Revo is perfectly happy running around the ten pound mark, once you start running bigger, heavier lipos, your truck will weigh up to 1.5 pounds more and you'll start breaking stuff more often. It's your call.