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Battery, Zinc-Carbon (non-mercury)
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Zinc–carbon batteries are used in flashlights, calculators, toys, clocks, smoke alarms, remote controls, transistor radios, and garage door openers.
A zinc-carbon battery is a dry cell primary battery that delivers about 1.5 volts of direct current from the electrochemical reaction between zinc and manganese dioxide. General-purpose batteries may use an aqueous paste of ammonium chloride as electrolyte, possibly mixed with some zinc chloride solution.