In operation since 2001, A123Systems is one of the leading suppliers of high-power, rechargeable lithium ion batteries in the world. The public company offers battery systems and packs for clients in the grid energy storage, transportation and consumer markets. It has developed a patented technology, Nanophosphate, as well as manages manufacturing facilities in Asia. A123Systems also offers the Hymotion L5 plug-in conversion module. The company provides APR18650M1 cells for handheld products and appliances. In addition, it manages an energy solutions group that offers custom and off-the-shelf systems. A123Systems clients include Shanghai Automotive Industry Corporation, Fisker Automotive, and Black & Decker.