Absorbent Glass Mat or AGM batteries are another type of sealed lead acid battery. AGM batteries work when sulfuric acid is absorbed by a very fine fiberglass mat.
AGM batteries do not require regular watering like flooded batteries. The mats themselves do not absorb and are not affected by the acidic electrolytes which allow them to work effectively without any maintenance and bring the benefit of working in a larger temperature range. The leading advantages of AGM batteries is that charging is up to five times faster than Wet Cell battery and the ability to deep cycle.
The main trade-off for an AGM battery is its low life expectancy, and each charging cycle can harm the life and performance of the battery. Manufacturers recommend discharging only up to 50% of their capacity per charging cycle, allowing the battery to last up to 1,300 cycles.