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Old 11-29-2014, 12:12 PM   #22
Paul
Porsche "Purist"
 
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Join Date: Aug 2003
Location: Wisconsin
Posts: 2,123
Garage
I use 3 of these and hardwire them to the battery. $29.

http://www.amazon.com/Yuasa-YUA1201000-Automatic-Battery-Maintainer/dp/B00HZTDKZG/ref=dp_ob_title_auto
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1998 Boxster with 7.8 DME, 2005 3.6 liter/325 hp, Variocam Plus, 996 Instrument panel
2001 Boxster original owner. I installed used motor at 89k.
1987 924S. 2002 996TT. PST-2
Owned and repaired Porsches since 1974. Porsche: It's not driving, it's therapy.
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