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AGM or absorbed glass mat design batteries have been around for a long time. Probably the best known brand is Optima. While much more durable, longer lived, and vibration resistant than a conventional design battery, they will still go dead in a stored Porsche without a proper maintainer attached due to the car's inherent parasitic current draw............
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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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