Batteries (red): Although flywheels have been developed to store energy in 2009 were only used electric batteries lithium ion. Comprising some 40 individual cells last two races, and usually is mounted on the floor of the pontoon under the radiators. To be loaded and unloaded several times each lap was very hot and need water cooling systems or oil, even with its own pump and radiator.
What we do will be a challenge for designers is the accommodation of the KERS components, especially batteries. With the ban on refueling teams have expanded fuel tanks to the pontoons, which has been forced to make longer and narrower radiators. In 2011, with the KERS batteries, the pontoons will have to be more bulky, which penalize some aerodynamics, but not enough to negate the advantage provided by their extra power.