ACDelco 31AGMCRAT Professional AGM Heavy Duty BCI Group 31 Battery Specialized construction case and elements provide 14x vibration protection. Durable design protects against the worst enemy of a truck battery - road vibration (compared to standard flooded batteries) Active material and AGM grid provide 2x greater cycling and protection against the heavy strain caused by frequent start-ups, overnight cab power demands, and long periods of use (based on the SAE J2185 HD test standard) 40% greater charge acceptance and quicker recharge (compared to standard flooded batteries) Low self-discharge with a 60% greater shelf life and longer lasting battery (compared to standard flooded batteries) Robust envelope separators are designed with a puncture-resistant back web with a rib design to improve acid circulation and provide low resistance, which allows the battery to remain cooler to extend battery life