updated 4/21/2011 8:46:53 AM ET 2011-04-21T12:46:53

WALTHAM, Mass., April 21, 2011 (GLOBE NEWSWIRE) -- A123 Systems, Inc. (Nasdaq:AONE), a developer and manufacturer of advanced NanophosphateTM 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 http://ir.a123systems.com/ .

What: A123 Systems' first quarter 2011 financial results conference call
When: Monday, May 9, 2011
Time: 5:00 p.m. ET
Webcast: http://ir.a123systems.com/ (live and replay)
Live Call: (877) 266-0479, domestic
  (678) 894-3048, international
Replay: (800) 642-1687, passcode 59338026, domestic
  (706) 645-9291, passcode 59338026, international

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 www.a123systems.com .

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

AONE-F

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

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