Yeah. Except no one can figure out how the system would work.<p>The Roadster&#x27;s battery pack costs $28,000. The Tesla Model S&#x27;s battery pack is expected to cost $10,000+ AFTER the efficiency of the Gigafactory in 2020.<p>Swapping out a $10,000+ part and sharing it between cars is going to be a major, MAJOR business &#x2F; economic question. How do you do it fairly? How do you ensure that the quality of the battery remains the same? Can people cheat the system?