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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. |
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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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Click picture for larger view |
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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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Click picture for larger view |
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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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