  Car battery plates.
These are the lead plates from one cell of a lead-acid battery of the type commonly used in cars (actually this is from a 24V cell because that's the only kind I was able to find without any acid in it). In an operational battery these plates would be soaking in sulfuric acid, making dis-assembly a bit dicey.
Source: eBay seller trifectasales
Contributor: Theodore Gray
Acquired: 21 April, 2009
Text Updated: 21 April, 2009
Price: $20
Size: 8"
Purity: 90%
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