If you took the LIPO battery itself most of the commercially available lipos would fit in the current cars.
But, we all insist that the battery is covered in a plastic case which adds a couple of mm to all the dimensions.
If you were to put a plasitic case on your NIMHs they wouldn't fit in your car either, in fact if you put an extra layer of heatshrink on some of last years cells they wouldn't fit in your half the cars.
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