I bought a Battery Tender Jr (by Deltran about $40) -- with all the subsystems in modern vehicles that still use battery current after the key is removed, buying a cheap battery charger is the last thing I want to hookup to my car's power.
BTW, the Porsche branded battery charger available at dealer's parts dept for $125 can be purchased directly from CTEK for a round $75 (last time I checked).
Regards,
paul...
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