[Unsullied_Spy]

For Buggies and Truggies, you could just build a little plastic box that can hold the lipo and have a quickly unsnappable lid that would hinge towards the center. Just drive in, lift the side of the body, unsnap the battery cover, unhook the battery, slide in the new battery and plug it in and you're off.

I'd be fine with a quick removal system, but since I'm a basher it isn't essential.