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How to Determine the Age of Your Battery


How do you read the date codes on the batteries?

Positive Terminal - Manufacturing Date. This code indicates the actual date when mechanical assembly of the battery was completed. At this point, electrolyte has not been added to the battery and formation charging has not taken place. LETTER stands for the month and could be anything from A to L (A=January, B=February, C=March, and so on), NUMBER stands for the date.

Negative Terminal- Shipping Date. This code indicates the month and year when the battery was shipped out of our factory. LETTER stands for the month (see below); NUMBER is the last digit of the year.


A battery with “D15” stamped on the positive terminal and “J2” on the negative. “D15” means that the battery was assembled, without electrolyte, on April 15th. “H4” means that it was shipped from the factory around August 2004.


Submitted by Mike Sundberg - 2/06/06

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