This has been tried a few times, and Elon has even demonstrated it on the Model S (it's faster than filling up a large-tanked luxury car). The super charger is

This has been tried a few times, and Elon has even demonstrated it on the Model S (it's faster than filling up a large-tanked luxury car). The super charger is close enough to instantaneous that I think we'll get to fast-enough recharge times and large enough capacities before we get to a nationwide battery-swapping network.