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-12 Mercury Hearing Aid Battery

The Mallory RM-12 1.4 volt mercury battery was used in some body-worn vacuum-tube and transistor hearing aids starting around 1950 to about 1959.

It weighed 1.4 oz., and measured 1 15/16" high by ⅝" 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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Side view of the Mallory RM-12 mercury battery. It looked like a button battery on steroids. The extra capacity was needed in some early transistor hearing aids, although many used the more common "N" sized (401) battery.


 

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Top view of the Mallory RM-12 mercury battery showing the negative terminal.


 

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End view of the Mallory RM-12 mercury battery showing the model number, positive terminal "+" sign and the patent number.


 

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Bottom view of the Mallory RM-12 mercury battery showing the positive terminal.

 


 

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