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The previous two batteries are lead acid flooded batteries, meaning their case is essentially a plastic box with fluid that floods the battery’s lead plates. There are other battery types, including gel-cell and AGM, or absorbent glass mat. Probably the most popular AGM battery is the Optima, which uses spiral cell technology where the lead plates are tightly wound into a cylinder form and sandwiched with the absorbent mat that holds the electrolyte and prevents it from spilling. The Optima battery is sealed and there is nothing to really do maintenance-wise save for keeping the connections clean and tight and ensuring the battery is charged.