The Mega Infraction RTR includes a 7-cell 8.4V NIMH battery in the box and while this battery is a great starting point, upgrading to a Lipo can help dial up the fun factor even more. Using a Spektrum 7.4V Lipo pack helped bring out more performance from the truck improving the speed, responsiveness, and the overall runtime. A simple upgrade to a Lipo battery can do a world of wonders.