Hugh Hetherington Hearing Aid Museum
Hugh Hetherington Hearing Aid Museum

The Hearing Aid Museum

Hearing Aids of all types—Ear Trumpets, Carbon Hearing Aids, Vacuum Tube Hearing Aids, Transistor Hearing Aids, Body Hearing Aids, Eyeglass Hearing Aids and much more!

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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

Mallory RM-3 Mercury Hearing Aid "A" Battery

The RM-3 1.4 volt mercury hearing aid "A" battery was used in vacuum tube hearing aids in the 1940s and 1950s. The RM series of batteries was manufactured by Mallory.

The RM-3 mercury battery weighed about 1⅜ oz., and measured ⅝" high by 1" in diameter.

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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Bottom view of the Mallory RM-3 mercury hearing aid battery.

 

 

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Side view of the Mallory RM-3 mercury hearing aid battery.

 

 

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The Mallory RM-3 mercury hearing aid batteries could be purchased in boxes of 4 batteries.

 

 

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Opened box of Mallory RM-3 mercury hearing aid batteries showing the batteries.

 

 

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Front view of the Mallory RM-3 mercury hearing aid battery box.

 

 

 

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Rear view of the Mallory RM-3 mercury hearing aid battery box.

 

 

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Side view of the  Mallory RM-3 mercury hearing aid battery box.

 

 

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Opposite side view of the Mallory RM-3 mercury hearing aid batter box.

 

 

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The picture at the right shows the three sizes of the Mallory RM mercury battery series. From left to right they are the RM-4, RM-3 and RM-1. There doesn’t appear to have been an RM-2 battery used in hearing aids.

 


 

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