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+1 on Ctek, it is the actual make of the Porsche branded ones - just cheaper for missing the logo, not really out of snobbishness as it's no pricier than other brands, but it's been reliable long term and came with all sorts of useful connectors like permanent lines you can install on a car that seal with rubber caps, cigarette lighter connector, normal clips.... I've since equipped all my cars with the connection you clip on so now I never need to open a car's hood anymore to plug them in. It's particularly useful on modern porsches that wake up like 17 different ECUs when you pull a door handle, and you can never get a real voltage reading once the car is awake and the battery under attack.
On another note, talking about useful tools, a few months back I finally bought a "real" battery tester, not a voltmeter or the kind that smokes (a SOLAR BA9 40-1200 CCA Digital Battery and System Tester). I've been fooled in the past with the regular load testers and voltage meters telling me a battery was good or bad and that was incorrect. The above tests a battery based on its type, its CCA rating, and does a bunch of tests on the cells, measures what's left of the CCA now and whether or not it should be recharged or is not worth the hassle. Saved me a lot of head scratching, I recommend it highly for $50 when you order your Ctek - useful tool to have and no battery needed, it powers off your tested battery ;-) (that's my public service announcement for the day ;-)
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