Duracell RM-401H Mercury Hearing Aid Battery
This Duracell RM-401H 1.4 volt mercury hearing aid battery was
manufactured by Duracell Inc. of Bethel, CT beginning in 1978.
This battery weighed 0.3 oz. (8 g), and measured 1 1/8" by about
7/16" in
diameter (2.8 x 1.2 cm).
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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Side view of the black Duracell No. RM401H mercury battery showing the
Duracell name and model no. (RM401H). Note: the positive terminal of the battery is
at the bottom (right side). 401-sized batteries were also known as "N"
batteries. This battery is equivalent to the
Beltone
BP401R, the
Eveready E401E, the
Rayovac RP401
and the Zenith ZM401
batteries, or indeed, any "N" battery or batteries with the core numbers
"401" in the model number.
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Standing view of a red Mallory/Duracell No. RM401H mercury battery. This
was an earlier version of the above black battery. In 1964 the P. R.
Mallory Company, makers of Mallory batteries, trademarked the name
"Duracell", which stood for "durable cell" battery.
Between 1964 and 1980 Mallory batteries carried the double Duracell
and Mallory brand names. This red Mallory/Duracell battery was made
somewhere in that time period.
In 1978 the company was purchased by Dart Industries and renamed
Duracell. Since 1980, Duracell batteries have not included the Mallory
name. |
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Side view of the red Duracell No. RM401H mercury battery showing the
double brand—Mallory, in smaller letters, above the much larger
"Duracell" letters.
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Top view of the black Duracell No. RM401H mercury battery showing the
negative terminal.
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Bottom view of the black Duracell No RM401H mercury battery showing the
basic battery size "401" with the + for the positive terminal on each
side.
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Front view of the red Duracell No. RM401H mercury battery box from
between 1964 and 1980.
This box contained 2 batteries.
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Front/side view of the box of the black Duracell No RM401H mercury batteries,
dating from 1980 and later, showing the name and model number. The box
also held two batteries. Note the two holes on the side. There were
corresponding holes on the other side so you could use a battery meter
and test the batteries without taking them out of the box. The batteries
were packed so the positive terminal was on the right (see top left
corner of the side (+ Test).
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View of the top of the box of the black Duracell No. RM401H mercury batteries
showing the name and model number.
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