There actually was a Chinese EV startup that had battery swap stations: drive up onto the system, and the battery is directly under your car; the swap takes <1 minute. I don't remember what it was called, though, nor if it ever made it.

Update: it's Nio.

There was one like that in Taiwan for scooters.

When was hot-swapping batteries normal? What was the backup power source? I'd only ever seen normally swappable batteries where the phone would need to power off and back on.

Gogoro a moped/scooter company in Taiwan has these. Little stations all over the country where you can swap your battery out, it was pretty amazing.

Just make hot swapping batteries normal again like it used to be.

In your ideal scenario would you own multiple batteries and keep them at your house, or are you looking for a subscription service where you would just buy the car (batteryless?) and then go to a rental station to have one put in, swapping batteries when they need a charge?