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A mercury battery -LRB- also called mercuric oxide battery , or mercury cell -RRB- is a non-rechargeable electrochemical battery , a primary cell .. electrochemical battery. battery ( electricity ). primary cell. primary cell. mercury. Mercury ( element ). Mercury batteries use a reaction between mercuric oxide and zinc electrodes in an alkaline electrolyte .. The voltage during discharge remains practically constant at 1.35 volts , and the capacity is much greater than a similarly sized zinc carbon battery .. Mercury batteries were used in the shape of button cells for watches , hearing aids , cameras and calculators , and in larger forms for other applications .. button cells. button cells. For a time during and after World War II , batteries made with mercury became a popular power source for portable electronic devices .. mercury. Mercury ( element ). Due to the content of toxic mercury and environmental concerns about its disposal , the sale of mercury batteries is now banned in many countries .. mercury. Mercury ( element ). toxic mercury. Mercury poisoning. Both ANSI and IEC have withdrawn their standards for mercury batteries .. mercury. Mercury ( element ). ANSI. ANSI. IEC. International Electrotechnical Commission