Battery pack for Volvo

The battery which will go into the Volvo C30 is made by Indianapolis-based Ener1. The component on the left fits in where the gas tank would go and the other portion will go down the middle in the back. The size of the battery is a reminder of how important improving energy density is in auto batteries. Lithium ion batteries have plenty of power to move a car, but better energy density would mean that a battery of a given size would allow for a longer range and take up less space, saving on costs.