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An Optima is still a lead/acid battery, but made differently. AGM stands for "absorbed glass mat". I stole the following off the internet :
"Glass mats, cushioning the ultra-thin lead plates, will squish like a sponge. In turn, manufacturers can squeeze more glass mats and lead into one battery. More lead equals more power. Plus, that squish factor means the battery’s insides are packed tightly.
AGM batteries also have valves regulating the amount of hydrogen and oxygen gas allowed to escape during charging. They fall under a broader category of valve-regulated, lead-acid (VRLA) batteries, typically used for storing a lot of power for a long time or for long-running power uses."
I have always used my regular chargers and tenders on them without any problems. They seem to last 13-14 years for me.