I don't really understand all this talk about "Your" battery, "My" battery etc. since it doesn't seem to be the sane way to do things.

Sell me the car without battery, make me sign up for a battery service at $X per month which guarantees access to batteries at the swap-stations (The first 'swap' being done when I get the car) and done.

Let me treat batteries like I treat AWS servers, totally replaceable cattle. No ownership issues, no "swap YOUR good battery for a dud one" issues.