Thanks for the input guys, currently im using 4000mah i bought cheaply from HK (
http://silverbackrc.com/en/products_...c2id=503&page=) im using them on a 13t Hobbywing esc combo and they seem okay in my 2wd durango.
Im going to get an 8t motor and new speedo soon, whats a decent battery for this combo without burning the cash?