I bought a Panasonic battery. A code is shown on the battery.
I am afraid the production date maybe 2014.

How can I determine of production date of this battery ?

Pansonic Battery LC-P1228P

I've checked with the supplier and they said batteries are made with 2016.

  • Just checking, but are there any other stamps on the battery? Like, on different edges than can be seen in this pic? Commented Nov 26, 2016 at 17:10
  • Where did you buy the battery from? Apparently, Panasonic batteries that are installed at the Toyota factory don't have the standard marking on them. Do you not trust whoever sold it to you? Why? On the good side, apparently, this model of battery is very good and will last for many years longer than a cheap battery. Commented Nov 26, 2016 at 17:18
  • @ZachMierzejewski [1] , No just that one label and its just on top side .
    – Root125
    Commented Nov 26, 2016 at 17:22
  • 1
    @ZachMierzejewski, maybe not for this battery, it is rated for a 10 year life in standby applications. $47 is a very good price on this battery, Mouser lists them at $91.94 each for 30 units. That makes me think that they may be out of date, so you may well be right about the marking being the date code. I'd suggest calling an authorized distributor (in the US, Mouser or Digikey would be candidates).
    – dlu
    Commented Nov 26, 2016 at 22:04
  • 1
    I'm voting to close this question as off-topic because the question is about batteries for solar power applications. Also, we're mostly speculating about what the marks on the battery mean…
    – dlu
    Commented Nov 26, 2016 at 22:10

2 Answers 2


I would assume it follows the usual production coding sequences.

14 =2014

12 =12th week

03 =3rd day of the week

A= the production shift

Tuesday March 18th 2014 on the day shift.

  • 2
    Is that coding a standard of some sort? If it is it would be cool to have a reference to it.
    – dlu
    Commented Nov 27, 2016 at 20:28
  • Yes, one of many variants
    – Old_Fossil
    Commented Jun 23, 2019 at 23:15

For the record, the Panasonic Datecode format is YYMMDD + shift indication letter.

This is explained into the Panasonic VRLA Technical Handbook INDUSTRIAL BATTERIES FOR PROFESSIONALS available at https://eu.industrial.panasonic.com/sites/default/pidseu/files/downloads/files/panasonic-batteries-vrla-for-professionals_interactive.pdf

  • There you go..thanks for the confirmation . These kind of codes are used in a variety of manufacturing environments. .with a few variants such Julian date code, YMD code, some use year,week, day, shift. Sometimes date codes encoded in lot numbers, etc
    – Old_Fossil
    Commented Jun 23, 2019 at 23:14

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