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I had been under the impression that since the failure of Shai Agassi's Better Place, battery swapping for electric vehicles was dead. Not so, it seems. It's apparently alive and on the rise in China and India. The key to its success there: the government's willingness to set standards for the swapping interface for any manufacturer who wants to participate. The video I've linked is to an information-rich episode of Youtube channel Just Have a Think.
A major advantage of battery swapping -- beyond really fast "refueling" -- is that the swapping station holds a lot of partially-depleted storage capacity that doesn't have to be quickly recharged. It plays well with intermittent renewables and places less demand on electrical infrastructure than fast-charging stations.