A123 Systems, Inc., designs, develops, manufactures and sells rechargeable lithium-ion and energy storage systems. In the transportation industry market, the Company works with global automotive manufacturers and tier 1 suppliers to develop batteries and battery systems for hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs) and electric vehicles, (EVs). Its transportation business is divided into two categories: heavy-duty and passenger. As of December 31, 2011, the Company's product offerings included batteries in various sizes and forms, as well as packaged modules and fully-tested battery systems. The platform for battery and battery system development is its Nanophosphate material. The Company designs and develops batteries and battery systems for ALTe, Axeon, BAE Systems, BMW, Daimler, Delphi, Fisker Automotive, Inc. (Fisker), General Motors (GM) Magna Steyr, Navistar, Shanghai Automotive Industry Corp and other customers, for multiple vehicle models.