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18Cambridge researcher envisions portable charging stations for electric cars

Until now, one of the big downsides of battery electric vehicles (EVs) was the risk of running out of energy before getting back to a charging station. When an internal combustion vehicle runs dry, a driver can always call roadside assistance to bring some fuel or just hike to a station and bring back a can of gas or diesel. Under the same circumstances, an EV would require a tow to an outlet somewhere.

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