While I don't see a way around the issue of "where does the energy come from", the obvious answer to the battery swapping is to rent the battery, not own it.

Would probably need to be owned by the company that does the battery swaps to recharge, though it would be a HELL of an initial investment.

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It's justifiably immoral to deal morally with an immoral entity.

C'est la vie. Festina lente.