You can't "swap" EV batteries unless you want to take the chassis off the frame and that will take a **** of a lot longer than a few seconds.
You can't "quick change" an EV battery.
I wonder what it would take to engineer a practical EV in which the battery was easily and quickly swappable.
With electric forklifts, it's pretty routine. The forklift that I drove when I worked at the now-gone Campbell's Soup factory here in Sacramento used a battery that was roughly a cubic yard in size, and weighed about 3,500 pounds. Later in my time at that factory, we had
“fast” chargers installed, to which we connected our forklifts when they were not in use, but even they could not charge our forklifts fast enough to keep up with the rate at which we discharged them while using them, so we still had to swap batteries fairly often. before we had these fast chargers put in, we typically had to swap batteries once or twice per shift. Afterward, it was down to maybe once every two or three days. The procedure involved a second forklift, and took maybe five or ten minutes.
There are ways that these forklifts were made, very different from what would work for a street-going car, that made swapping batteries relatively easy and quick. I don't think street-going cars could be made very much like these forklifts, but perhaps some clever engineer can come up with a practical way to make them easy to swap batteries.
If this could be worked out, then I could envision an infrastructure wherein stations would exist, where you could drive your EV there with a nearly-empty battery, have it swapped out for a full battery, and drive off. The station would recharge that battery, and it would be swapped in to a future customer, just as the full battery that you just had put in was some past customer's nearly-empty battery.
The size of the battery itself might be the problem. As I mentioned before, the battery in my forklift was about a cubic yard in size, and weighed about 3,500 pounds. That's more than the weight of a typical compact sedan. I once got it into my head to wonder how much energy it could hold, relative to a quantity of gasoline. On doing some online research, I learned that a gallon of gasoline contains roughly 33.7 kilowatt-hours of energy that can be released by burning it. The battery in my forklift, was nominally 48 volts, with a claimed capacity of 850 amp-hours, which comes to 40.8 kilowatt-hours. That's a battery that weighs more than a car, and it had only slightly more than a gallon-of-gasoline's worth of capacity. Now this was an old-school lead-acid battery, far from the best we have these days as far as capacity relative to size and mass. We've got much better battery technology, that can store more energy in less weight and less volume, but even so, I don't know that a battery with enough capacity for a practical EV can possibly be small enough or light enough to be swapped out like a forklift battery.
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