Unknown Carbon Hearing Aid Battery (3)
This unnamed carbon-zinc 3-volt hearing aid battery was used in
carbon hearing aids around 1937.
This battery weighed 7.0 oz (198 g), and measured
3˝" high
by 2 3/16" wide by 1⅛" thick (8.9 x 5.6 x 2.9 cm).
This battery came with a
Gem Model 30
Standard "4" carbon hearing aid.
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Front view of the carbon hearing aid battery "3"showing the plain black
covering. There are no manufacturer's marks on this battery. This
battery is identical in size and terminal placement to the
Gem 1A battery.
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Top view of the carbon hearing aid battery "3" showing the battery terminals. The
terminals were set along the back edge of the battery, not in the center.
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" (2.5 cm) apart.
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Bottom view of the carbon hearing aid battery "3" showing the date
"Jul 1937".
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