Mallory RM-3 Mercury Hearing Aid "A" Battery
The RM-3 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 Mallory.
The RM-3 mercury battery weighed about 1⅜ oz., and measured ⅝" high
by 1" 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-3 mercury hearing aid battery.
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Side view of the Mallory RM-3 mercury hearing aid battery.
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The Mallory RM-3 mercury hearing aid batteries could be purchased in boxes of 4
batteries.
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Opened box of Mallory RM-3 mercury hearing aid batteries showing the
batteries.
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Front view of the Mallory RM-3 mercury hearing aid battery box.
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Rear view of the Mallory RM-3 mercury hearing aid battery box.
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Side view of the Mallory RM-3 mercury hearing aid battery box.
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Opposite side view of the Mallory RM-3 mercury hearing aid batter box.
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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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