Here's the battery tender I just bought:
http://www.sears.com/shc/s/p_10153_12605_02871219000P
It comes with three different types of attachments - cigarette lighter, clamps and rings that fit on the battery cable bolts. All three hook to the end of the charger using a connector.
I haven't decided which to use, but the rings that fit on the battery cable bolts looks like the best solution. I've had problems with devices that attach to the cigarette lighter popping out of my Boxster. It seems like the cigarette lighter in the Boxster is slightly smaller than in other cars.
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2000 Arctic Silver/Black, Hard Top, On Board Computer
PNP Rear Speakers, HAES 6-Channel Amp, Avic Z140BH,
Painted Bumperettes, 2004 (OEM) Top, Homelink integrated in dash with Targa switch, 997 Shifter, Carrera Gauge Cluster with silver gauge faces, heated 997 adaptive sports seats, Litronics, silver console
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