Someone on another forum was looking for information regarding the age of the battery in his car. If you have a car with a Delco battery and you aren't sure if the battery is original, this information will give you the build date of the battery.
From the Delco battery site.
How do I read the warranty date code on my battery?
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.
ACDelco Canada ? Battery Warranty