This is what I think they may secretly be working on for instant charging. Like you stop by a Tesla Super Duper station, and the battery in part or as a whole is just hot swapped with robotics and you're on your way in say 5 minutes
It's no secret – they've promised and demoed that capability for a while – but the rollout has been slow, and may be primarily motivated by gaming the tax-credits available if the Model S has a 'fast-fueling' option. See for example:
