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

520 Mercury Hearing Aid Battery

This No. 520 1.4 volt mercury hearing aid battery by an unknown manufacturer was used in transistor hearing aids in the mid-1950s.

The No. 520 mercury battery weighed about 0.03 oz (~1 g), and measured ½" in diameter by ¼" thick (1.2 x 0.7 cm).

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Top view  of the No. 520 mercury battery showing the model number (520) and some patent information.

 


 

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Bottom view  of the No. 520 mercury battery. This was one weird-shaped battery. The bottom was hollow.

 


 

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Side view  of the No. 520 mercury battery.

 

 

 


 

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