lol .. I just hooked up a 4s in my truggy box and its unreal .. iv seen 4s's in bump boxes and i knew what it would do but man this is just unreal . over the summer iv had many boxes and used other peoples boxes and this is simply the best i have ever seen . started out with a car battery and then tried some stick packs then got the gel cel and all of them i could stop with a finger and the lipo , nah man my finger aint stopping that