@roamer_1
I'm not so sure I'd want a pile of potential firebombs around the station or service bays If I was a gas station owner. If one of those cooks off in a charging area, all Hell (almost literally) could break loose.
Maybe as a separate facility, and I can see it working similar to the propane tank exchanges (Blue Rhino, etc.), but only as self-serve if the battery swap was idiot proof. (Considering how creatively stupid idiots can be, that would be a challenge.)
You'd need a full service attendant or two, just to check over the incoming exchange batteries, monitor charging, and help folks with swaps.
That would still take some serious advancements or changes in design, because current EV batteries weigh between 1000 and 2000 lbs. 
They wouldn't be generally self-swap. the weight is too great, and the available surface area for cartridge access would be limiting:
Lets say there is a removable rocker panel that spans between the wheel wells along the side of the car, down low... What, four, maybe six cartridges down each side? Lets say 5, for ease... So 10 cartridges... 2000 total weight / 10 = 200 lb cartridge weight, in round, totally bar napkin terms.
And no small fete, handling them puppies. BUT, swapping in and out, with a forklift around, and a modded jack, purpose made, pretty doable in 15 minutes or so I'd say. That's approaching the fill rate for a ICE vehicle.
That is a doable thing.
Yes, it's volatile - But service stations operate with a whole lot of volatiles all the time. Who better?
And lets explore that... The only bus that is onboard the vehicle is the backbone bus that receives the cartridges... The rest of the heavy current busses are onboard each battery cartridge, out of the car and inspect-able on a regular basis at each recharge cycle - I don't know what that means precisely, but you would think it would be a better means of catching failure points before they happen - Far better than if it is buried inside the car till it finally goes.
And yes, stupid proof - But gas station attendant stupid-proof - There's a whole lotta stuff already that way that works. Mo bedda than joe-homeowner stupid-proof... Not optimal, I know, but better.
Smart battery tech is pretty robust. You should be able to diagnose and replace a particular batt-pack in a cartridge before failure... If the pack is accessible and diagnosed. Of course, that would require a technician, but that can be built into general mechanical skill pretty easily. Servicing battery cartridges would be a thing. But a job system for that is a high-grade blue collar position, which is a good thing.
I dunno. Just kicking the idea around.
I ain't exactly against it, any more than I am against batt operated tools. I still have corded tools, and pneumatic tools hanging around for when the batts can't make do... But I tell you what, the batt operated stuff does the lion's share around here anymore.
And I am offended in the winter, when it is 20 below, and I have to drag cords all over hell's half acre... I am mad that I have to drag the cords, which translates to being mad at corded tools, not that the batt can't go.
Battery tools have replaced corded around here, and barring my current dilemma, certainly would have replaced pneumatics - I had been looking at 1/4, 3/8" battery impact gear for my shop.
In that same light, a jacked up electric golf cart may well solve my near-by transportation issues. I have one, even now. I also have a side by side that needs some work. Dunno which way that will break just yet. But that I am considering the golf cart should be noted.
So like I said, I ain't against it, proper. I'm alright with anything that works. I am just kickin around a way to make that system work, or work better than the thing that got shoved down our throats... THAT is what pissed me off.
