You probably can't remove the body as the circuitry inside is so delicate and small it's not really designed to be tampered with....
I sold a lot of these Micro R/C cars a couple of years back, mainly the Tomy Bit-charG sort of cars, although you could put different motors and batteries in i wouldn't say they were designed for everyone to tinker about with.
Look quite cool though, but soooooo small they're really not much good for anything other then playing on a desk/table etc.
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