They could have at least drawn a torsion spring rather than a compression spring, and a generator with a more realistic aspect ratio, and I think that would hav

They could have at least drawn a torsion spring rather than a compression spring, and a generator with a more realistic aspect ratio, and I think that would have given them more space for the actual battery. Overall the idea seems like "sound science" (engineering really) in the sense that there's no reason it would be impossible or even difficult to build. It just... has no practical value at all.