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My OEM AC Delco AGM battery was 7 years old when I replaced it and it was still cranking the starter jus fine. Your battery may be approaching 6.5 years of age, so you may want to replace it, sometime this year or early next year.
Aftermarket batteries have a date code on the top label, but I am not sure all "factory" batteries have the code on them. Seems like I had a Camaro battery that I never could find the code on either.
The warranty date code is located on the top label of the battery. The first character is either a P or S. The next two digits determine the month, the third digit is year and the fourth digit indicates the manufacturing plant. For example, P 094N means the battery was made in September 2004 in the New Brunswick factory.
Last edited by TEXHAWK0; Jan 13, 2009 at 10:02 PM.
Most battery companies use a letter for the month and number for the year on the side of the battery, such as small round stickers. A would stand for January and 8 would stand for 2008.