Panasonic No. 401PM (Size "N") Mercury Hearing Aid Battery
The Panasonic No. 401PM 1.4 volt size "N" mercury battery was made
by Matsushita Electric Industrial Co Ltd of Osaka, Japan around 1970 or
thereabouts.
The Panasonic 401PM battery weighed 0.3 oz.
(8 g). It measured 1 3/16" high
by 7/16" in diameter (2.9 x 1.1 cm). |
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Front view of the Panasonic No. 401PM battery showing the model
number—401PM. "N"-sized
(401) batteries were
commonly used in transistor body aids in the 1950s and 1960s. They are
still used for some assistive listening devices today.
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Side view of the Panasonic No. 401PM battery showing warning.
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Another side view of the Panasonic No. 401PM battery showing the model
number—401PM,voltage—1.4 volts, and the polarity—+ at top.
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Top view of the Panasonic No. 401PM hearing aid battery showing the
positive terminal.
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Bottom view of the Panasonic No. 401PM hearing aid battery showing the
negative terminal.
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Front view of the Panasonic No. 401PM hearing aid 2-battery plastic
blister pak.
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Rear view of the Panasonic No. 401PM hearing aid 2-battery plastic
blister pak.
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