  Ni-Cad battery.  
A common nickel-cadmium battery.  These have fallen out of favor due to the toxied nature of cadmium.  Nickel metal hydride and lithium ion batteries are pretty much better in all ways.. 
Source: eBay 
Contributor: Theodore Gray 
Acquired: 11 March, 2009 
Text Updated: 12 March, 2009 
Price: $5 
Size: 2" 
Composition: NiCdMn
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