Whoa! Improve appeal? Maybe.
But....I'm going to take a relatively new electric car in and take pot luck on whatever age battery may be charged up for swap at that moment?
We're talking about roughtly a $10,000 part of the automobile. And I'm going to exchange a new one for whatever?
Forget it.
I see your point. However, I'd think that with the right combination of warranties, folks might be persuaded to adopt the model. Something like, “As long as you get your battery swapped at a Tesla Authorized Service Center, we will provide you with working batteries that will meet XXX-levels of performance, without incurring the cost of a new battery, until you've driven your Tesla motorcar for 100,000.”
Or whatever.
If Tesla can't persuade folks to adopt the swap model, and can do no better than an incomplete charge in 20 minutes, then I think the company's chances for long-term success, sans government subsidies (or possibly even WITH government subsidies), are much weaker.
sitetest