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8.4V zinc-air batteries.
An example of the element Zinc

Sample Image
Zinc 8.4V zinc-air batteries
8.4V zinc-air batteries.
These batteries are the size and shape of a standard 9V battery, but they are air-breathing half-fuel cells instead. See the previous sample for more information about how zinc-air batteries work. Note that these come sealed in a metalized Mylar vacuum pack: As long as the package remains unopened their shelf-life is virtually unlimited, because one of the components needed to make the battery work, air, has been excluded. My understanding is that after you open the package it takes a couple of minutes for the voltage to build up, then the battery is ready to use.
Source: eBay seller dmhsgeneralstore
Contributor: Theodore Gray
Acquired: 15 January, 2004
Text Updated: 29 January, 2009
Price: $6/3
Size: 2"
Purity: 10%
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