I'd handle breakdowns with a tow truck, if that's available. It would be nice to have a place to plug in an auxiliary battery, so that one car could "jump" another, with big booster cables between them, either for charging or slow driving. However, battery problems are usually not sudden and complete.
I hope that half-million dollar robot for battery swaps included the car and building. I'm sure that any racing pit crew could do it in a quarter the time, and that robots will always beat people, given enough money. That demonstrator could have been just re-programmed to have the battery cart in position, waiting for the car, and generally speeded up. The fun part comes when we try to standardize batteries, possibly with modular packs, and adapt the robots to other variations that designers might want to try.
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