Autozone Duralast battery date code decipher

General
1

Good afternoon, men. 07 F150 screw 5.4 purchased used has a Duralast Gold 65-DLG battery. It looks like the stamped production code is

3M20CM9A
How old is this battery? Autozone staff say “if you buy your battery here, we can always look it up for you”. They think it’s a Johnson Controls battery.
Any assistance appreciated.

2

To figure out the Duralast battery date code:

  • Find a sticker on the battery’s top or side that shows when it was made (like 4/19).
  • The first two numbers tell you the month, and the next two numbers tell you the year.
  • You can usually find this code stamped or printed on the battery label.