Hello, but I bought my Son a Summit for Christmas I liked it so much I went and bought me one, my question is I bought some 4200 MAH batteries I heard they would run longer than stock, which they do but I would like to know how big of a battery the summit motor can handle without burning it up. I want to keep it pretty much stock, I would like a little more run time and maybe more speed but curious. I am really new to this site and these trucks, so any help would be great, and maybe where people buy there batteries from. And thanks to all of you that help people like me. Thanks Jeff