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To properly charge a car battery, one must drive that car on the freeway for quite some time... well over a couple of hours.
If your battery is just drained because of lack of use, then you need to buy a trickle charger.
However, if it won't hold a charge, it's time for a replacement.
Do a thread search here for battery replacement comments... Porsche batteries are rather expensive and not that high-quality. The owner of the site swears by a brand sold at Sam's or Costco, believe it or not.
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