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Hearing aid batteries.
An example of the element Zinc

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Hearing aid batteries.
Zinc-air batteries for hearing aids. You can see the air holes on the back side!
Source: Radio Shack
Contributor: Theodore Gray
Acquired: 2 April, 2009
Text Updated: 3 April, 2009
Price: $5
Size: 0.375"
Purity: <10%
The Elements book Mad Science book Periodic Table Poster  Click here to buy a book, photographic periodic table poster, card deck, or 3D print based on the images you see here!