A123 Systems

A123 Systems, LLC is a developer and manufacturer of lithium iron phosphate batteries and energy storage systems. It is a subsidiary of the Chinese Wanxiang Group Holdings.

The company was founded in 2001 by Yet-Ming Chiang, Bart Riley, and Ric Fulop. By 2009, it had about 2,500 employees globally and was headquartered in Waltham, Massachusetts. Its original product technology was based upon materials initially developed at the Massachusetts Institute of Technology.