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 (2)

This unnamed carbon-zinc 3-volt hearing aid battery was used in carbon hearing aids around 1909.

This battery weighed 6.1 oz, and measured 3˝" high by 2⅛" wide by 1 1/16" thick.

This battery came with a Stolz Electrophone carbon hearing aid.

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Top view of this carbon battery showing the battery terminals. The terminals were set in the center of the battery, not along one edge.

Note that the left terminal is thicker (⅛") than the right terminal (3/32") to prevent this battery being plugged in backwards and thus reversing the polarity.

The terminals are set 1 7/16" apart.

 

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Bottom view of this unnamed carbon hearing aid battery. The number 754 may be the model number and the R574 the lot number. Another battery has the same 754 top number, but R570 on the bottom.

 


 

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