AGM (absorbed glass mat) is a newer technology compared to the conventional lead-acid battery that was invented 160 years ago. Regular batteries are made from thin lead plates  that are flooded with sulfuric acid and water. AGM is made from glass mats cushioning the ultra-thin lead plates. The additional plates mean faster recharging and a longer lifespan. Some estimates claim that an AGM battery will last three times longer than a conventional car battery.