I bought the battery tender which plugs into the cigarette lighter port. Very convenient. I keep it on during winter storage.
BTW: I also use a battery tender on my Harley davidson during the winter. It cost about $50 less than the porsche unit..... hmmmm...... same technology
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'04 Black Boxster, 18" Carerra wheels
"If you're not living on the edge, you're taking up too much space."
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