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Costco doesn't do any testing of anything. Battery warranty is done on a return for refund basis. You just return it to customer service and go buy a new one.
As far as testing goes, usually an autozone/advance auto will test for free. They also have very expensive chargers that are very good at resuscitating dead batteries (to cut down on warranty exchanges).
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2011 M3
2006 Sierra 2500HD 4WD LBZ/Allison
2004 X5 3.0i 6MT
1995 M3 S50B32
1990 325is
1989 M3 S54B32
Hers:
1989 325iX
1996 911 Turbo
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