Unknown Carbon Hearing Aid Battery (4)
This unnamed carbon-zinc 3-volt hearing aid battery was used in
carbon hearing aids around 1935.
This battery weighed 3.0 oz (86 g), and measured 2 11/16" high
by 1⅝" wide by 13/16" thick (6.8 x 4.1 x 2.1 cm).
This battery came with as
Ardente "1"
(Single) carbon hearing aid.
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Front view of the carbon hearing aid battery "4" showing the plain black
covering. There are no manufacturer's marks on this battery. This
battery is almost the same size and terminal placement as the
Ardente No. 77 battery.
It is about ⅛" narrower. As a result, it could probably be used in any
hearing aid that used the Adrente No. 77 battery.
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Top view of the carbon hearing aid battery "4" showing the
spring-clip battery terminals. These terminals pressed against similar
clips in the top of the battery case. Note the faint "+" on the left
battery clip indicating the positive terminal.
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Bottom view of the carbon hearing aid battery "4".
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