A123 Systems competes in the Li-ion battery space with companies such as Advanced Battery Technologies (ABAT), Altair Nanotechnologies (ALTI), China Sun Group (CSGH), Ener1 (HEV), Hong Kong Highpower Technology (HPJ - Get Report), and Valence Technologies (VLNC).
A123 Systems, with its lithium-ion technology, also competes with advanced lead-acid battery (lead carbon) producers like Axion Power International (AXPW.OB), C&D Technologies (CHP), Enersys (ENS) and Exide Technologies (XIDE).
Let's not forget the NiMH (nickel metal hydride) battery. ECD Ovonics (ENER) has licensed its battery technology to every major manufacturer of NiMH batteries, all 35 of them. It's a market projected to be $1.23 billion for HEVs in 2011 compared with a $320 million market for automotive Li-ion batteries.