Hugh Hetherington Hearing Aid Museum
Hugh Hetherington Hearing Aid Museum

The Hearing Aid Museum

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Click on the "General Information" button (top button above) for an overview and general information on this category of hearing aid.

 

Hearing Aid Batteries

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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