Mallory M-504 Carbon-Zinc Hearing Aid "B" Battery
The Mallory M-504 15 volt carbon-zinc hearing aid "B" battery was
manufactured by the Mallory Battery Co in the USA. It was used in
vacuum tube hearing aids around 1950.
The M-504 carbon-zinc battery weighed 0.3 oz. (8 g), and measured
1⅜" long
by 7/16" on each side (3.4 x1.5 cm).
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Front view of the Mallory M-504 battery showing the manufacturer
(Mallory), the voltage (15 volts) and the model number (M-504). The
gold-colored inscription reads, "15 volts "B" battery for hearing aids".
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Right side view of the Mallory M-504 battery showing the polarity. The
positive terminal was at the top.
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Top view of the Mallory M-505 showing the positive battery contact.
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Bottom view of the Mallory M-504 showing the negative battery
contact.
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