EnerSys are the original manufacturers of the U.K.'s most widely used motorsport batteries, their product having been historically marketed under various popular brand names. For 2009 they have updated and improved the product and ar offering a bigger range than ever with the best ever performance and reliability direct to the motorsport market. This gives the user more choice, more performance and we are even able to offer them at lower prices!Built to withstand the extremes of competition, increased vibration resistance allows them to withstand the constant pounding, extreme heat and high vibration that high revving competition engines can generate. They have the performance to start high compression engines using high current draw starters yet remain lightweight and compact.The Odyssey Extreme Racing battery can handle it. Featuring rugged construction and packed tightly with pure lead plates, the non spillable AGM design of the Odyssey Extreme Racing battery protects against the shock and vibration that can quickly destroy other batteries. The pure lead plates mean more power - twice the overall power and three times the life of conventional batteries.