Zenith ZM401 Mercury Hearing Aid Battery
The Zenith ZM401 1.4 volt mercury hearing aid battery was made by the
Zenith Radio Corporation of Chicago, IL for use in their hearing aids
beginning in 1954 and through the 1960s.
The Zenith ZM401 mercury battery weighed 0.375 oz. (11 g), and measured 1⅛" high
by 7/16"
in diameter (2.9 x 1.15 cm).
Batteries of this size were known as "N" batteries. N-sized batteries were the most common size of battery used in
transistor (body) hearing aids in the 1950s and 1960s.
Mercury batteries are no longer sold today because of the mercury in them, and the consequent environmental
concerns.
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Front view of the Zenith ZM401 mercury hearing aid battery. This battery is equivalent to the
Beltone BP401R, the
Duracell RM-401H, the
Eveready E401E and the
Rayovac RP401.
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Left side view of the Zenith ZM401 mercury hearing aid battery showing
the polarity arrow and indicating the positive (+) polarity is at the
bottom of the battery. Below that is the Zenith name and the model
number of this battery (ZM401). |
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Right side view of the Zenith ZM401 mercury hearing aid battery showing it is a 1˝ volt
size "N" battery. The inscription above that reads, "Do not
recharge or discard in fire."
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Rear view of the Zenith ZM401 mercury hearing aid battery showing the
inscription, "Distributed by: Zenith Hearing Instrument Corp.,
Chicago, ILL. 60635 U.S.A., Made in U.S.A.".
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Top view of the Zenith ZM401 mercury hearing aid battery showing the
negative terminal.
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Bottom end view of the Zenith ZM401 mercury hearing aid battery showing
the positive terminal.
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