>As I said before, if it works a hundred year battery
would make electric cars feasible.
>But, using parked cars as part of a 'distributed storage
system' - is a BAD idea.
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I, personally, would want to usually be using my own on-site power. A hundred-year battery would allow me to do that.
Being connected to the grid is something I would want to use sparingly, or during an emergency.
Of course, adding hardware so “the grid” could never siphon off your car battery power against your rules would be both necessary AND trivial to add.
Right now, my ideal system would keep me 100% isolated from the grid unless and until my PV + battery power fell uncomfortably low. I'm not a communist, after all. If I am “selling” my power off my battery, I would expect a significant personal profit from the transaction.
I'm glad you see the potential huge value in a 100 year battery.