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Correct Replacement Batteries (NSC WM09N711)

RyMoeller

By RyMoeller
in Watch Repairs Help & Advice

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RyMoeller Super WRT Addict

RyMoeller

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Hello All,

Wondering if anyone has any experience with this particular watch.  It's a National Semiconductor LED watch, model WM09N711, from the mid 1970's.  I have no idea if it works.  The pusher button is missing but can be replaced- but before I get to that, I would like to confirm the LED module still works.  The only problem?  I have no idea what type of batteries to put inside of it!  The battery specification isn't inscribed on the caseback nor the LED module.  I've done a little research so far and have struck out trying to confirm what batteries go into this fine piece.  If anyone happens to know it would be a great help.  Thanks in advance for all responses and Happy Holidays.  🙂

IMG_0623.thumb.jpeg.0dafb8f2bedc7caae97a8ec13d2ef90b.jpegIMG_0625.thumb.jpeg.6dc58bdc72fbea8ec6a6dbcdc540e603.jpegIMG_0626.thumb.jpeg.7ff03880ec5577bb33ebe6d70b9087da.jpeg

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jdm Distinguished Member

jdm

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7 minutes ago, RyMoeller said:

 I have no idea what type of batteries to put inside of it!  The battery specification isn't inscribed on the caseback nor the LED module.

Measure the slots and reference from the attached table. I believe that either alkaline 1.5V or silver oxide 1.55 V will not make a difference. To see if it works fit any battery you may have which makes contact.

1_Battery Cross Reference Guide.pdf

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Randy55 Member

Randy55

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Posted
7 hours ago, RyMoeller said:

Hello All,

Wondering if anyone has any experience with this particular watch.  It's a National Semiconductor LED watch, model WM09N711, from the mid 1970's.  I have no idea if it works.  The pusher button is missing but can be replaced- but before I get to that, I would like to confirm the LED module still works.  The only problem?  I have no idea what type of batteries to put inside of it!  The battery specification isn't inscribed on the caseback nor the LED module.  I've done a little research so far and have struck out trying to confirm what batteries go into this fine piece.  If anyone happens to know it would be a great help.  Thanks in advance for all responses and Happy Holidays.  🙂

IMG_0623.thumb.jpeg.0dafb8f2bedc7caae97a8ec13d2ef90b.jpegIMG_0625.thumb.jpeg.6dc58bdc72fbea8ec6a6dbcdc540e603.jpegIMG_0626.thumb.jpeg.7ff03880ec5577bb33ebe6d70b9087da.jpeg

Check out the 4th photo in this listing. I think you will get all the info you might need from this..

https://www.ebay.com/itm/124972474298?hash=item1d18f09fba:g:4OgAAOSw~eNhdveu

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RyMoeller Super WRT Addict

RyMoeller

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Wow, thanks for all the great responses!  I used the charts provided and came to the conclusion the 386 is probably the correct battery (which is what I was leaning towards before I asked the question but my methods were based on more ignorant assumptions) The photos @Randy55 linked provides the proof.  Can't wait too see if I can get this thing to light up!

Thanks again for the help and the documentation- it will certainly come in handy in the future as well! 👍

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