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Unpatchable AMD Chip Flaw Unlocks Paid Tesla Feature Upgrades
(www.tomshardware.com)
This is a most excellent place for technology news and articles.
I saw a documentary about Renault doing this in Israel I think. With a network of stations looking like auto wash: it takes your car, opens a door under the car, swaps the battery with a full one and off you go.
Apparently it went bankrupt after a year (2012-2013): https://en.wikipedia.org/wiki/Better_Place_(company)
Tesla had this exact functionality with their original Model S' ... but like that company it wasn't profitable (or it was just regular ol Tesla mismanagement) so they also stopped doing it.