A123 Systems, Inc. is a manufacturer of lithium-ion (lithium iron phosphate) batteries and battery systems for the transportation, electric grid and commercial markets. The company has about 2,500 employees globally and is headquartered in Waltham, Massachusetts. The company was founded in 2001 by Dr. Yet-Ming Chiang, Dr. Bart Riley and Ric Fulop. The company's nanophosphate technology is built on nanoscale materials initially developed at the Massachusetts Institute of Technology.  Wikipedia