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http://www.computerworld.com/article/3051678/car-tech/govt-researchers-develop-wirelessly-car-chargers-that-are-faster-than-plug-ins.html
The DOE researchers claim their wireless charging system has achieved 95% efficiency, meaning only 5% of the electricity is lost from the source to the car's lithium ion battery system; it is typical, even for plug-in systems, to lose as much power in the charging process.