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Because my 98 Boxster is a summer "Sunday Driver" (never sees rain or snow) I keep mine plugged into a Battery Minder (a battery maintainer) 24/7 when I'm not driving it. My Interstate battery is 7 years old and still going strong. I have Battery Minders connected to all my vehicles, other than my daily driver.....at about $35-$45 each they're a lot cheaper than batteries and I think they do a great job.
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