A123 Systems is a company that specializes in advanced battery technology, particularly lithium-ion batteries. Founded in 2001, it focuses on providing energy storage solutions for electric vehicles and renewable energy applications. The company is known for its innovative battery systems that enhance performance and efficiency. In 2012, A123 Systems was acquired by Johnson Controls, a global leader in building and automotive systems. This acquisition allowed A123 to expand its reach and improve its technology, contributing to the growing demand for sustainable energy solutions in the automotive industry and beyond.