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

Lamina UM-5 Hearing Aid Battery

The Lamina UM-5 (type "N") 1˝ volt  battery was made by the Toyo Dry Battery Co. Ltd. of Japan around 1960.

The Lamina UM-5 was a carbon-zinc  battery and weighed 0.1 oz. (4 g). It measured 1 3/16" high by 7/16" in diameter (3.0 x 1.1 cm).

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Front view of the Lamina UM-5 battery.

"N"-sized batteries were commonly used in transistor body aids in the 1950s and 1960s.

They are still used for some assistive listening devices today.


 

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Top view of the Lamina UM-5 hearing aid battery showing the positive terminal.


 

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Bottom view of the Lamina UM-5 hearing aid battery showing the negative terminal.

 

 


 

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