The Porsche branded charger is not
a charger but a maintainer. It will not charge a run down battery. It will maintain one at or near full charge.
You need 3 things...a cigarette lighter socket In the C320 that fits the Porsche charger, a lighter socket that is powered directly by the battery and isn't switched off when the ignition is turned off and a 12v system. We know you have the last, perhaps you can tell the first 2.
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