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The OEM "Porsche" battery is not a maintenance free design; it is a “flooded” design and it requires topping off regularly with distilled water. Most of the “Porsche” branded batteries we see are not the ridiculously over priced German Moll battery, but are made by Interstate Battery (they even feature them on their website) in the US. You can confirm this by looking on the bottom of the OEM battery; it has the manufacturer’s name on it.
As for the using a trickle charger, one word: Don’t. Trickle chargers actually speed up the death of healthy batteries, what you want is a battery maintainer, which (unlike a trickle charger) lowers the charge rate and then turns completely off when the battery is fully charged. Maintainers can significantly lengthen battery life as they keep them in optimal condition while the car is not being used.
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