A New Battery Takes Off in a Race to Electric Cars

A123Systems, a start-up in Watertown, Mass., says it has created a powerful, safe, long-lived battery. If the cell fulfills the ambitions of its maker, that softer sound will be the future of automobiles. The goal for A123Systems’ battery for plug-in hybrid cars is to achieve 155 miles to the gallon and reduce demand for gasoline by 70 percent.

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