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Heavily-shorted A123 Systems (AONE +9.6%) adds to Friday's gains after announcing it's expanding...

Heavily-shorted A123 Systems (AONE +9.6%) adds to Friday's gains after announcing it's expanding its electric grid storage product line. A123's grid storage deals (I, II) have been a bright spot for a company whose electric car battery ops have been hit by disappointing sales and recalls.
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