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How do zinc-carbon batteries work?
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battery
Cutaway view of an alkaline–manganese dioxide power cell.
The zinc-carbon battery, also known as the Leclanché cell, is a traditional dry cell that functions through an electrochemical system involving three primary components:1
- Anode: The negative electrode is a zinc alloy sheet or "can" that serves as the battery's container.1
- Cathode: The positive electrode consists of manganese dioxide blended with carbon black and an electrolyte. This mixture is formed around a central carbon collector rod, which acts as the electrode.1
- Electrolyte: The internal medium is a saturated aqueous solution of ammonium chloride mixed with approximately 20 percent zinc chloride.1
When in use, these components facilitate an electrochemical reaction that generates an initial voltage of 1.55 to 1.7 volts. This voltage gradually declines as the battery is depleted, eventually reaching an end point of about 0.8 volt. The design is enclosed in an overwrap structure with metal covers to ensure proper electrical contact.1