Absorbent glass mat batteries typically last four to seven years if owners use them for deep cycling applications and properly maintain them. Some AGM batteries can last up to 10 years, and most provide a minimum of 150 deep discharge cycles.
To properly maintain and maximize the life of AGM batteries, owners should recharge their batteries slowly and without overcharging them. Furthermore, it is important that owners try to recharge AGM batteries as soon as possible and before they use more than 50 percent of their capacity. When storing, owners should recharge batteries when they lose over 20 percent of their charge.