Dead after 2 years but thankful for Costco's warranty.

My Costco battery died after 2 years. It actually happened while getting my car serviced so I was not left stranded. This is the shortest life I have ever seen on a battery. I replaced my AC Delco after six years only due to preventitive maintenance. Anyway Costco refunded the full purchase price. Clearly the must be some issues with their batteries because they no longer carry the Kirkland brand and have switched to Interstate.
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Have a Kirkland Signature battery in my 2004 Chevy Cavalier with 133k miles. Sticker shows the battery made 7/11 and I bought it August 2011. Almost 6 years later, it's mostly working but starting to wane.
Ohioan on 4/25/17