My
periodic table poster
is now available!
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%