Mallory RM-1 Mercury Hearing Aid "A" Battery
The RM-1 1.4 volt mercury hearing aid "A" battery was used in vacuum
tube hearing aids in the 1940s and 1950s. The RM series of batteries was
manufactured by P. R. Mallory & Co, Inc. of North Tarrytown, NY.
The RM-1 mercury battery weighed 0.43 oz., and measured 0.65" high
by ⅝" in diameter.
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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Bottom view of the Mallory RM-1 mercury hearing aid battery showing the
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Side view of the Mallory RM-1 mercury hearing aid battery. |
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Mallory RM-1 mercury hearing aid batteries were sold in boxes of 4.
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The picture at the right shows the three sizes of the Mallory RM mercury battery series. From left
to right they are the RM-4, RM-3 and RM-1. There doesn’t appear to have
been an RM-2 battery used in hearing aids.
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