ACDelco ACDB24R Advantage AGM Automotive BCI Group 51 Battery Maintenance-free Absorbed Glass Mat (AGM) technology - no water required, no spills, no leaks, and no maintenance Valve regulated-gas recombinant technology, can provide up to 3-times the cycle life of conventional auto batteries in traditional vehicle applications Calcium positive and negative, full-frame power path grids, provide higher cranking amps and lower self-discharge rates for off season storage (compared with antimony and calcium flooded technology) Leak-proof pressurized valve system is engineered for safety and long life. Prevents dry-out and acid damage to the terminals High density plate oxide provides for maximum power-per-pound and dependable high cycling service