Most states have an outdated law that required a wet cell battery to run the lights in cars because at the time wet cell batteries were the only rechargeable batteries out there, because of this it might be 100 more years before we see lead acid batteries leave, this is why even EV's have a lead acid battery that is charged off the dc to dc converter.
From what I remember there are about 4-5 lead acid battery companies in the USA and I don't recall any lead gel battteries in the USA.
Just like store brands, Duracel does not make their own lead acid battery.
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