Yup, one of those 2 intelligent amp chargers. I got mine at Wally World. It has a quick connect on the low voltage side, that I connected inline after the vehicle's battery connector. That way, my little guy is handling low voltage. I also had one that is supposed to mount right to the vehicle (like a boat or riding mower.) But I didn't want him plugging it into 110v.
But I am not as smart as I sound... ( /forums/images/graemlins/shocked.gif) I knew to do all this, but waited tilll they fried the stock battery. So I had to replace that... I pulled one out of an UPS from work, and that thing really goes now. I need to move the battery back over the drive wheels now. All this for a toy!