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

Unknown Carbon Hearing Aid Battery (5)

This unnamed carbon-zinc 3-volt hearing aid battery was used in carbon hearing aids around 1921.

Although it is unnamed, it is identical to the Globe No. 5 carbon-zinc battery, and is of a similar vintage.

This battery measured 3 9/16" x 2 3/16" x 1⅛" (9.1 x 5.5 x 2.9 cm). It weighed 6˝ oz (184 g).

The pin spacing was exactly 1" (2.5 cm). Note that the pins are of uneven diameter. The right pin is thicker (⅛") than the left pin (3/32") in order to preserve correct polarity.

Having the right pin thicker than the left pin was very unusual. Almost all other batteries were the reverse with the larger pin on the left.
 

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Back

 
Front view of the carbon hearing aid battery "5" showing the black paper covering with a design embossed in the paper.

 

 

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Close-up front view of the carbon hearing aid battery "5" showing the design embossed in the paper.

 

 

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Top view of the carbon hearing aid battery "5" showing the battery terminals. Note that the terminals were not set in the center of the battery, but were almost flush with the back of the battery.

This provided better stability for hearing aids like the Mears "Intensitone" carbon hearing aid (which used this very battery) since the microphone for that aid was "front heavy" and would fall on its face if stood up.

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Bottom view of the carbon hearing aid battery "5". Someone stuck a piece of paper on this battery with the date 8-6-21 indicating a date of August 6, 1921.

 

 


 

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