AGM stands for Absorbent Glass Mat Battery. The sulphuric acid in the battery is absorbed into a very fine fibreglass mat, making the battery spill-proof.
AGM batteries can charge up to 5 times faster than standard batteries and can deep cycle up to 80% without damaging the battery. A conventional battery can usually manage around 50%.
AGM Batteries have up to 5 time the amount of cycle life in the battery than conventional batteries.