WARREN, MICHIGAN - January 19: A Chevrolet Volt battery is loaded into a temperature chamber by Cammi Stewart, Battery Systems Test Engineer, rear, and Andrew Norton, Battery Systems Test Engineer, front, at GM's Global Battery Systems test facility in Warren, MI, Tuesday, January 19, 2010. Battery cyclers will help the engineers understand how the batteries will operate in extreme hot and cold temperatures. (Jeffrey Sauger)
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