How do I Read the Manufacture Date on a Trojan T-105 Battery?

Written by irene a. blake
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Since 1925, Trojan Battery Co. has designed and manufactured deep-cycle batteries for a wide range of vehicles. The 6V Trojan T-105 battery, typically used in golf carts, RVs and marine vehicles, goes through two manufacturing stages: initial manufacturing and final inspection/shipping. The dates for these stages, known as the manufacturing date and shipping date, are historically found embedded on the positive and negative terminals and moulded into the plastic battery top. To read these dates, you simply need to understand the coding system that Trojan uses.

Skill level:


  1. 1

    Check the positive terminal on your battery for the initial manufacturing date—a one-character and two-digit code. The character, a letter from A through L, represents the month, beginning at A for January and, going sequentially through the calendar, ending at L for December. The two digits refer to the date of the month. For example, the code "C22" means March 22.

  2. 2

    Inspect the negative terminal for the shipping-date code—sometimes referred to as the warranty start date—which represents the date that the manufacturing process ended and the battery became ready for shipment. The character, a letter A through L, refers to the months January through December. The digit, 0 through 9, refers to the year. For example, "B3" refers to February and any year ending with the number "3."

  3. 3

    Turn the battery so that you can read the information moulded into the plastic top. Check for the shipping date code in the middle of numbers moulded in the plastic. Read it the same way that you would the date on the negative terminal.

Tips and warnings

  • If you need the manufacturing date for warranty purposes and your battery shows dates on both the positive and negative terminals, refer to the date on the negative terminal as the warranty start date.
  • If you have a Trojan T-105 older than the current decade, contact Trojan for assistance with determining the original manufacturing date.
  • Trojan T-105 batteries made after approximately 2005 don't have the initial manufacturing date on the positive terminal—only the shipping date on the negative terminal or the plastic top.
  • Although Trojan deep-cycle batteries don't typically last more than a decade, you may have an older battery that you're trying to read. As Trojan's method of showing the year in the shipping date doesn't distinguish among decades, it isn't always possible to determine the manufacturing date of a battery older than the current decade.

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