Did You Know Batteries Lose Power
When They're Sitting on the Shelf?
A battery can permanently lose some of its capacity when it's stored in a partly or fully discharged state. Periodic charging during storage can minimize the deterioration, but not all battery distributors and dealers do the necessary charging. That's why you may want to know how to read the date codes on a new product, to help you make sure you're really buying a fresh battery.
Interstate Batteries representatives rotate batteries every 90 days to maintain fresh product.

When Was Your Battery Born?

Battery performance can fade with age so learning to read battery date codes, which show when the product was manufactured, is helpful to know when buying or diagnosing batteries. So, how do you find and how do you read a date code?
Most Brands of Batteries
datecode examples JOHNSON CONTROLS, INC. - INTERSTATE BATTERIES, Motorcraft
East penn - Deka
GNB -Champion, Stowaway

The letters and numbers are on a sticker affixed to the battery or hot-stamped into the case cover along the top edges of the battery. The ship date codes begin with a letter: A stands for January, B for February and so on (some shipping codes skip the letter I, so it cannot be confused with the number 1. In those cases, J would represent September, K - October, L - November and M - December). The next digit is a number which represents the year the battery was shipped. Therefore, an A6 would mean the battery was shipped in January of 1996.
Exceptions
DELCO - Freedom, Voyager, and some Sears brands The code dates are stamped on the cover, usually near the posts. The first character represents the year (0-9) and the second shows the month (A-M, skipping I). For example, 4CN1 would stand for 1994, March. datecode examples-Delco
DOUGLAS - Farmland Find the code dates stamped near the terminals or occasionally on a sticker affixed to the battery. Only the first five characters of a multi-character code are significant to measuring freshness. Douglas uses the letters in their name to indicate the year of manufacture in the first character; the following characters, 1 through 12, represent the month. (D-1994, O-1995, U-1996, G-1997, L-1998, A-1999, and S-2000). So, G12 stands for December, 1997. datecode examples-Exide

EXIDE - Napa Legend, Edge, Power-Tron and Titan
The fourth or fifth character may be a letter code for the month and the following character a number code for the year (i.e. RO8F3B stands for June 1993).

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