KERS (Kinetic Energy Recovery System) is an 80 bhp speed boost that can be used for 6.67 seconds per lap. KERS is signified by a battery icon in the lower right corner. If it is full, it will be red. As you use KERS, the battery will deplete. When you're coming alongside an opponent, press and hold to activate your KERS and cleanly overtake them (do not touch the other car).
Note: Three of the teams do not use KERS. These teams are Lotus, Virgin and HRT.
Note: It must be done in a race, qualifying and practice do not count.