Photos: Green tech grows in Boston

Boston Power started four years to make lithium ion batteries for laptops. It is now moving into the automotive market, using the same basic cells, seen in blue inside this battery pack.

The company has applied for a Department of Energy loan program set up to encourage domestic auto battery manufacturing. It hopes to build a plant in central Massachusetts in a facility that is now a retailer's warehouse.

Photo by Martin LaMonica/CNET

Caption by Martin LaMonica