Duracell RM-401H Mercury Hearing Aid Battery
This
is the Duracell RM-401H 1.4 volt mercury hearing aid battery used as the "A"
battery in the
vacuum tube hearing aids and as the only battery in transistor body hearing aids in the 1950s
and 1960s.
This battery weighs about ˝ oz., and measures 1 1/8" by ˝" in
diameter. Mercury batteries of this size were known as "N" batteries.
Mercury batteries
are no longer sold today because of the large quantities of mercury in
them, and the consequent environmental concerns.
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Battery box for Mallory/Duracell RM-401H batteries. This box holds 2 of the
above sized batteries.
Note that in the beginning, Duracell was a Mallory brand. Later,
Duracell became its own brand. The box at the right is when Mallory
owned the Duracell brand. The battery above was made after Duracell
became a stand-alone name.
This battery is equivalent to the
Beltone
BP401R, the
Eveready E401E, the
Rayovac RP401
and the Zenith ZM401.
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