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Optima's are lead acid technology, just in a patented AGM sprial wound format. They are lighter by a few pounds than a comparable flooded unit, and they do live a lot longer; often more than twice the life of a conventional flooded design unit. I own four of them, including one that is approaching its tenth birthday, and it recently load tested as though it were brand new.
And don't hold your breath waiting for lithium batteries to come down to the price level of lead acid; it will never happen...................
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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