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2010 Plug-in Prius Prototypes – Click above for high-res image gallery

A vehicle in motion has a lot of energy passing through it various ways. The limited capacity of electro-chemical batteries means engineers have to find any way they can to reduce wasted energy and recapture as much as possible. The primary means of recapturing energy up until now has been regenerative braking, where the wheels turn the motor during deceleration causing it to charge the battery.