Hey guys, I just purchased a new Traxxas Summit 5607 and was disappointed about the stock battery life. Went out to get the most battery I could without reading my owners manual, I purchased 2 Lipo 5000 3 cell batteries which won't work, truck will turn on and steering works but no acceleration. Should I take the batteries back or change something else to make them compatible? If not which batteries should I purchase? Thanks in advance!