Duracell No. MP401H Mercury Hearing Aid Battery
The Duracell No. MP401H 1.4 volt mercury hearing aid battery was
manufactured for Duracell Inc. of Bethel, CT.
The No. MP401H mercury battery weighed 0.3 oz. (8 g) and measured 1⅛"
by 7/16" in diameter
(2.9 x 1.1 cm).
Mercury batteries were finally phased out of use in the USA in 1996
and were replaced by alkaline batteries which had been available for
some years at that point. |
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Side view of the Duracell No. MP401H mercury battery showing the model
number and voltage—namely, 1.4 volts. This battery is a size "N", a
popular size of battery for hearing aids used from the mid 1950s and
still in use today.
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Top view of the Duracell No. MP401H mercury battery showing the
positive terminal.
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Bottom view of the Duracell No. MP401H mercury battery showing the
negative terminal.
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