How to read the date code on an Interstate 12-volt and 6-volt automotive, commercial, or marine battery
A 4 or 5-digit shipping date code is engraved into the cover of each Interstate battery at the time the battery is shipped from the manufacturing plant. This code can only be seen when looking down on the top of the battery. The code is not on the label on the battery and it is not on the rim around the cover. The code is usually near one of the corners of the battery. This code tells when the battery was shipped from the factory to the local Interstate Battery wholesale distributor. The additional digits tell where the battery was made.
The first digit from the left side is a letter which stands for the month of the year. A = January; B = February; C = March, etc. The second digit from the left is the year that the battery was shipped from the factory. 4 = 2004, 5 = 2005, 6 = 2006, 7 = 2007, 8 = 2008, 9 = 2009, 0 = 2010, etc..
The national policy of Interstate Battery System is to recharge our batteries that are on a dealer's shelf or in our warehouse every 3 months in order to keep them fresh. Usually, a battery is sold to a consumer during the first 3 months after it is received from manufacturing plant.
If the battery has been recharged by an Interstate Battery wholesale distributor then there will be another date code on the cover of the battery. It will either be a 2 digit code that is branded into the cover or is on a small round label that is on the cover. In each case, the code will be read in the same way: The first digit from the left is a letter that indicates the month that the battery was recharged (A = January, B = February, C = March, etc.). The second digit indicates the year that the battery was recharged (4 = 2004, 5 = 2005, 6 = 2006, 7 = 2007, 8 = 2008, 9 = 2009, 0 = 2010).
How to read the date code on Interstate batteries with part numbers that start with the letter “U”
The date code on Interstate batteries which start with the letter "U" such as the U2200 is 3 digits long. The code is engraved into the positive terminal. The first digit starting on the left side is a letter. “A" is for January, "B" is for February, etc. The second digit from the left side is a number. 7 = 2007, 8 = 2008, 9 = 2009, 0 = 2010, etc.