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3D3DSilver oxide battery.
I'm not sure exactly why silver oxide batteries still exist. Lithium cells provide more energy at lower cost, so maybe it's just that there are still devices out there that want the particular voltage the silver batteries provide? I think they are used with hearing aids.
Source: Radio Shack
Contributor: Theodore Gray
Acquired: 2 April, 2009
Text Updated: 7 April, 2009
Price: $4
Size: 0.3"
Purity: <20%