GM selected two companies to provide advanced lithium-ion batteries: Compact Power and Continental Automotive Systems.  However, on August 9th, 2007 GM selected A123 to provide batteries.
A123Systems is a developer of next generation Lithium-Ion batteries. Founded in 2001, A123Systems’ proprietary nanoscale electrode technology is built on initial developments from the Massachusetts Institute of Technology.
Major investors in the company include General Electric, Alliance Capital, Sequoia Capital, North Bridge Venture Partners, FA Technology Ventures, OnPoint, the Massachusetts Institute of Technology, Motorola, Qualcomm, and Procter & Gamble, through its Duracell division.