I've always been a little uneasy about the battery swap idea. Would I really be happy to hand over the nice, shiny, new (but flat) battery that came with my (pick your own aspirational vehicle) for the scratched, dented and covered in cow dung one that the local farmer dropped off yesterday? And then find it only had a range of 100 miles rather than the 300 I was expecting because it's close to the end of its life. And even worse, then find the next recharge station won't take it without a 'surcharge' as it falls below their 'quality standards'.
I know they do it with bottles of propane / acetylene etc but with those it's fairly easy to tell if it's leaking or filled with the wrong stuff or whatever. I can see even the most regulated version of the battery exchange idea being fraught with "Del Boy' levels of sharp practice. At least with petrol what you're getting is - for the most part anyway - what you're expecting, and even if it isn't the cost of a tankful of fuel is a very small part of the value of the vehicle. You can afford to dump it and buy a new batch in extremis. Not so with batteries.
Just my view of human nature I suppose
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