12V battery date code

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

 

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

 

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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]

 

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

 

Can't argue with that photographic evidence, esp since I took the photos!

 

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.

 

Found this thread after failing to figure out where the mfg date on my battery was. My date code sticker had another sticker partially covering it so I couldn't see the "W" at the end. Finally figured it out and was amazed to find that my battery is the original - 6 years old! Just ordered a new one - not taking any chances.