Quote:
Originally Posted by kenchan
i would check your car for abnormal parasitic draw before blaiming it on the battery tender.
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Or get the battery tested. If it's a 2009, and it's now 2013, that's a pretty good run from a battery. I never had a problem with my Battery Tender Jr. And it seems odd that the solution from the manufacturer is "The cheap one won't work. The expensive one will. You should buy the expensive one."