Last week, Tesla Motors (NASDAQ:TSLA) showed off an innovation that can only be described as "cool": a system that swaps out the battery pack of the Model S and installs a new one -- in just seconds.

Tesla plans to roll this system out to its busiest recharging stations, to offer Model S owners an option to "refuel" quickly. But as contributor John Rosevear explains in this video, Tesla isn't just doing it for the cool factor -- there are a couple of good reasons to think that this will boost Tesla's profits.

Fool contributor John Rosevear has no position in any stocks mentioned. Follow him on Twitter at @jrosevear. The Motley Fool recommends Tesla Motors. The Motley Fool owns shares of Tesla Motors. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.