AONE A123 Systems, Inc. (MM)

A123 Systems, Inc. (Nasdaq:AONE), a developer and manufacturer of advanced Nanophosphate® lithium iron phosphate batteries and systems, announced today that it will release its second quarter 2012 financial results for the period ended June 30, 2012 before financial markets open on Wednesday, August 8, 2012. On that day, management will hold a conference call and webcast with supporting slides at 8:00 a.m. ET to review and discuss the Company's results for the second 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' second quarter 2012 financial results conference call
When:	Wednesday, August 8, 2012
Time:	8:00 a.m. ET
Webcast:	http://ir.a123systems.com/ (live and replay)
Live Call:	(877) 266-0479, domestic
	(678) 894-3048, international
Replay:	(855) 859-2056, domestic
	(404) 537-3406, international

Live and replay conference ID code: 18144497

The recording will be archived on A123 Systems' Web site for a period of 90 days.

About A123 Systems

A123 Systems, Inc. (Nasdaq:AONE) is a leading developer and manufacturer of advanced lithium ion batteries and energy storage systems for transportation, electric grid and commercial applications. The company's proprietary Nanophosphate® lithium iron phosphate technology is built on novel nanoscale materials initially developed at the Massachusetts Institute of Technology and is designed to deliver high power and energy density, increased safety and extended life. A123 leverages breakthrough technology, high-quality manufacturing and expert systems integration capabilities to deliver innovative solutions that enable customers to bring next-generation products to market. For additional information please visit www.a123systems.com.

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

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