Part 2 – How to Know Panasonic 18650 Battery Manufacture Date Code

New version of Panasonic 18650 Battery has 2 bars – a narrow bar and a wide bar. But the old version only has one narrow bar on the PVC. If you see a Panasonic 18650 battery has dot matrix on its top, it must be very old and be manufactured before 2009.

How-to-Know-Panasonic-18650-Battery-Manufacture-Date-Code-old-version
No matter new or old version, the same date code rule is followed.

How-to-Know-Panasonic-18650-Battery-Manufacture-Date-Code-read
You saw the 4 numbers(sometimes numbers+letters) on the bottom of the battery? They indicate the battery manufacture datecode.
1. The first digit = year(0 = 2010, 1 = 2011, 2 = 2012, 3 = 2013, 4 = 2014, 5 = 2015, and so on).
2. The second digit = month(1 = Jan., 2 = Feb., 3 =Mar., 4 = Apr., 5 = May., 6 = Jun., 7 = Jul., 8 = Aug., 9 = Sept., 10 = X, 11 = Y, 12 = Z).
3. The third and the fourth together = day(01, 02, 03, 04….29, 30, 31).

According to the rules, the battery above is made on 2013-01-26.

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