Toughness is built into every Odyssey battery at every stage of production. Pure lead plates support absorbed electrolyte giving a 'dry', leak-free sealed unit. Designed to high specification, the Odyssey battery is vibration resistant and will deliver its power in extremes of temperature from the frozen wastelands to the arid desert. The Odyssey batteries are even designed to provide starting current at 70% depth of discharge, so you really can depend on your Odyssey batteries !