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Zinc air cell


4.2.6 Zinc-air cell


Looks similar to mercury cell but have about twice the capacity. It uses air in its chemical sequences, and are usually supplied sealed; pulling a tab off energizes the cell by letting air in. 

Zinc-air cell
Zinc-air cell


Merits
It has a very long storage or shelf life before being de-energized,
It has a high e.m.f. of about 1.4 volts, and
It is relatively cheap.

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