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Nimrod, my 2004 986 (Australian right-hand drive model) does not allow charging via the cigarette lighter socket, and this is correct according to Porsche Australia. Apparently later models do permit charging through the socket. So perhaps you have the same problem. I maintain my battery with a Ctek MXS 5 charger via a quick-disconnect harness permanently on the battery, without disconnecting the battery itself, and have been doing this for at least 2 years without problems. Usually I set the charger to 800 mA, but may use 5 A if in a hurry. So you should be OK doing what you say. If still unsure, try asking a Porsche service centre?
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