Flashlight Battery
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…in this form in hearing aids, photoelectric cells, and electric wristwatches. The negative electrode consists of zinc, the positive electrode is of mercuric oxide, and the electrolyte is a solution of potassium hydroxide. The mercury battery produces about 1.34 V.
The fuel cell is another type of primary cell. It is unique in that the chemicals are not contained within the cell but are supplied from outside.
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**Bibliography**
WWW.flashlight/inventions/batteries.com
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