The reason I even brought up the idea of a swap station was because of speed. People want to cry because it takes 30 minutes to charge their battery, well if it could be swapped in 10 or 15 minutes, then that whole argument is moot, but of course then they'll find something else to demonize and whine about.
What about a batteries history? Easy, just like carfax, each battery has a serial number, when you goto swap there's a list of who had it, how hard they ran it, how deep it was discharged, how many times it was re charged, this is stupid easy to do, with a FULL history of the battery available. If YOU the customer were inclined you could look at the batterie's history, and go ooh, this one is only lasting about 200 miles between charges (it's older or whatever, it don't matter) I want THAT one instead because it's got 300 miles between charges, and im on a long trip and I want fewer stops.
Of course like everything else, this could also be capitalized too. Ok, we got 4 batteries available, battery 1 is a bit older and is not lasting very long, so we'll let you rent it for 10 dollars. Battery 3, is very new, so that one is 14 dollars. type thing. OR just charge people by the mile, rent the battery 3 cents a mile you put on it... the options are endless, but again, the swapping was implied for speed of turn around.
aaron