  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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