Hitachi has collaborated with a US battery-maker Johnson Controls to develop and make batteries for green vehicles.
The companies said that the deal was signed last month and covers lithium-ion batteries, which are used in laptops and other gadgets but starting to take off in auto technology such as hybrids and electric vehicles.
The collaboration includes cooperation in sales, marketing and standardization, and the companies may also work together in energy storage technology.
Hitachi has produced 1.2 million lithium-ion automotive battery cells for hybrid buses and trucks, and supplies Japanese truckmaker Isuzu Motors, and plans to supply General Motors.
Hitachi Battery Systems chief executive Yoshito Tsunoda said that the demand for efficient energy storage was expected to grow globally and he believes that the two companies will succeed in providing advanced, competitive batteries and related services through strong and fruitful collaboration.