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12V battery date code

Discussion in 'Gen II Prius Care, Maintenance and Troubleshooting' started by sub3marathonman, Jan 3, 2012.

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  1. sub3marathonman

    sub3marathonman Active Member

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    I've searched, because I thought it was such a basic question, but haven't found an answer.

    Where is the date of manufacture for the 12V original (or possibly replacement too) YUASA battery for the Prius?
  2. Patrick Wong

    Patrick Wong DIY Enthusiast

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    It is printed on top of the battery. You need to remove the battery bracket to see the date code.
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  3. sub3marathonman

    sub3marathonman Active Member

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    Thank you Patrick.

    However, the only thing I see that looks like a date code is 060209W. Is that the date code? And if it is, how do you decode it?
  4. koolingit

    koolingit Member

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    DD/MM/YY: Your battery was manufactured on the 6th day of February 2009.
  5. sub3marathonman

    sub3marathonman Active Member

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    Thanks koolingit.

    I had wondered if it was YY/MM/DD since that is the convention in Japan where it was made.
  6. Patrick Wong

    Patrick Wong DIY Enthusiast

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    .
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  7. Oldwolf

    Oldwolf Prius Enthusiast

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    According to this, and assuming a Japanese battery, it is decoded this way.

    Japanese and Taiwanese Coding
    [FONT=&quot]1st and 2nd digit – Year[/FONT]
    [FONT=&quot]3rd and 4th digits – Month[/FONT]
    [FONT=&quot]5th and 6th digits – Day[/FONT]
    [FONT=&quot]7th digit - Factory Code[/FONT]
    [FONT=&quot]Example: 9604010 equates to 1[FONT=&quot]st [/FONT][FONT=&quot]April 1996[/FONT][/FONT]
  8. koolingit

    koolingit Member

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    I beg your grace Patrick, but I think I stated the date code correctly.

    Let's take the battery you purchased last January:
    You say the battery was manufactured on August 25 2010.
    Pictures you included show the box with a blue tag saying 2010. 8. 25 and the date code on top of the battery is 250810W

    I'm going to try to put the link here: http://priuschat.com/forums/gen-ii-...us-12-volt-auxiliary-battery-installer-3.html It's message 28.

    I hope we can agree sub3marathonman's battery was manufactured on February 6th 2009
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  9. Patrick Wong

    Patrick Wong DIY Enthusiast

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    Can't argue with that photographic evidence, esp since I took the photos! :cool:
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  10. sub3marathonman

    sub3marathonman Active Member

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    I am appreciative of koolingit's help. But what I'm REALLY impressed with is that koolingit remembered a relatively obscure (no offense meant to Patrick :) ) picture that was posted over a year ago!!!
  11. koolingit

    koolingit Member

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    Any time Patrick speaks here, we all listen.

    He doesn't claim to know it all but he knows more than most of us when it comes to the Prius and he shares what he knows generously.

    I was having trouble with my battery at the time Patrick posted those pictures and they were a great help to me.

    That's where I learned the date code!

    Thanks again Patrick.
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