  Nickel metal hydride battery. 
Nickel metal hydride batteries are the generation between nickel-cadmium batteries and lithium ion.  They are still made for some specialized purposes, and are cheaper than lithium, but not as good for most uses. 
Source: Radio Shack 
Contributor: Theodore Gray 
Acquired: 11 March, 2009 
Text Updated: 12 March, 2009 
Price: $5 
Size: 2" 
Purity: <20%
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