You can stick any battery pack you want onto your truck. I had a 2600mah pack on mine mounted in some carbon fiber box I made and it worked great. I could go a whole weekend without needing a charge. Each tank was only like 100 -200mah it took out. Just be creative and you will figure something out. Actually now that I think about my greevo, my battery and fuel tank were swapped. I put an ofna tank were my stock battery went and made a carbon fiber mount and put my battery were the stock tank goes. If you look at some of my old threads I started im sure theres pics floating around.