I have a schumacher batt. tender and a CTEK 3300 and both will serve you well.
IMHO the CTEK is much better in built quality and it had every possible connection with the kit. I also got it on eBay for half of what a Porsche one costs. If I had to by one this would be it.
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2004 Boxster S Anniversary ed, hard top:
SOLD
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