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 TR-140 Mercury Hearing Aid Battery

The Mallory TR-140 mercury hearing aid battery was manufactured by the Mallory Battery Co in the USA. It was used in transistor body hearing aids in the mid 1950s.

The MalloryTR-140 mercury battery weighed 0.8 oz. (22 g), and measured 1 3/16" long by 1" by ˝" (3.1 x 2.5 x 1.3 cm).

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Back

 
Front view of the Mallory TR-140  mercury battery showing the model number (TR-140) and voltage (1.25 volts).

 

 

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Side view of the Mallory TR-140  mercury battery showing the manufacturer, location and patent numbers.

 

 

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Side view of the Mallory TR-140 mercury battery showing the positive polarity arrow and the rectangular positive terminal.

 

 

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Side view of the Mallory TR-140 mercury battery showing the negative polarity arrow and round negative terminal.

 

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Top view of the Mallory TR-140 mercury battery showing the rectangular positive battery contact (right) and the round negative battery terminal (left).

 

 

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Bottom view of the Mallory TR-140  mercury battery.

 

 


 

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