Deep-cycling performance, faster recharging and stronger starting are some of the attributes Interstate Batteries promises with the new 31-AGM7 extreme absorbed glass-mat (AGM) battery. According to the manufacturer, the commercial battery is the product of years of technology experimentation, testing and validation. Interstate’s AGM battery with Pure Matrix Power produces 400 cycles at 80% depth of discharge. Pure Matrix Power is a combination of pure non-alloy lead and an extra thin plate design. The maker said the pure lead without the common impurities of alloyed lead and the increased surface area of the thinner plates results in a battery that performs at a high level in both cranking the engine and powering electrical accessories.