The Optima battery, along with the Odyssey, WestCo, and a few others, is not a gel cell. It's an AGM (absorbed glass mat) battery, where the acid is absorbed by a big mass of fiberglass. But either way, the important thing is that it's not a wet cell battery. Wet cell batteries generate hydrogen gas, which is why the original E30 batteries were vented to the outside. (Other cars with ba
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