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      04-03-2013, 12:06 PM   #12
Lieutenant Colonel
Drives: 2008 BMW 335i sedan
Join Date: Jan 2010
Location: San Francisco

Posts: 1,754
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I have a Battery Tender, but have only used it when we were going to leave the car sitting for more than a month. Left it for 6 months once while we were overseas, and started up first couple cranks when we got back.

OTOH, I wound up not using it for a 6-week trip out of town last fall, and the car still started fine when we got back.
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