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The technology moves out of the lab and into commercial vehicles.
The new Prius is designed so that its battery pack can be swapped out for a plug-in lithium-ion battery.
Just as the company makes engines, it will now make battery packs for electric cars.
Technical advances jump-start electric cars, wind turbines, and solar power.
Free-piston engines could be used to generate electricity as efficiently as, and less expensively than, fuel cells.