A123 Systems Announces Date for First Quarter Results

WALTHAM, Mass., April 21, 2011 (GLOBE NEWSWIRE) -- A123 Systems, Inc. (Nasdaq:AONE), a developer and manufacturer of advanced Nanophosphate^TM lithium ion batteries and systems, announced today that it will release its first quarter 2011 financial results for the period ended March 31, 2011 after the market close on Monday, May 9, 2011. On that day, management will hold a conference call and webcast at 5:00 p.m. ET to review and discuss the Company's results for the first quarter. A recorded version of this webcast will be available two hours after the call and accessible at .

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About A123 Systems

A123 Systems, Inc. (Nasdaq:AONE) develops and manufactures advanced lithium ion batteries and battery systems for the transportation, electric grid services and commercial markets. Headquartered in Massachusetts and founded in 2001, A123's proprietary nanoscale electrode technology is built on initial developments from the Massachusetts Institute of Technology. For additional information please visit .

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FOR SUBSCRIBERSKratom-like substances are popping up in a typically benign supplement

FOR SUBSCRIBERSGOP super PAC increases its spending for Sen. Jon Husted in tough Ohio race

FOR SUBSCRIBERSRecords reveal tumultuous marriage between slain New York Times executive and wife

FOR SUBSCRIBERSFrom clean energy warrior to ‘wall of shame,’ James Talarico reverses on a fossil fuel money pledge

FOR SUBSCRIBERSCongressional staff planned official trip with luxury stops in Italy and France weeks before election

FOR SUBSCRIBERSA harrowing ordeal aboard an Israel-bound plane

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FOR SUBSCRIBERSThis Paralympian has two goals: Win medals and give away $500,000 to her teammates

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The A123 Systems, Inc. logo is available at http://www.globenewswire.com/newsroom/prs/?pkgid=6600

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CONTACT: Public Relations: A123 Systems Dan Borgasano 617-972-3471 dborgasano@a123systems.com Investor Relations: ICR, LLC Garo Toomajanian 617-972-3450 ir@a123systems.com