100 Month Warranty for 12 Month Battery

My 12877 lasted 12 months and 2 weeks. Crap battery and great warranty, which would be fantastic for something less critical like a TV. Have to make sure my jumper cables are close next July when the replacement goes. Warranty replacement went smooth, even without receipt.

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Purchased Kirkland 100 month dated 2/2012. It is in the process of dying 11/2016. Only holding 10 volts. Will take it back to Costco and see what the prorating is.
John on 11/29/16