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Drivers can either return the fresh battery pack upon their journey past the service station, or keep it. Tesla will bill later for the difference in value, and

• Someone 13y ago
  "Musk says that the service will cost about the same as a tank of gas." So, if you use this regularly, the cost benefit of electric cars decreases. Probably not much of a problem, as most trips are short and doable 'on your own battery'. It is an incentive to get your own battery back, though, and also may keep the actual usage of the service down a bit, so that they don't need to store zillions of batteries everywhere.