Eveready 145 Hearing Aid Battery
The
Eveready No. 145 was a most unusual battery. This 4˝ volt hearing
aid battery was, as near as we can tell, made specifically for just one
hearing aid—the
Western Electric Model 1A carbon hearing aid that came out in 1938.
Because it was only used in one hearing aid, it is quite rare.
It
weighed 9.2 oz. (260 g), and measured 4⅜" x 3⅜" x 1⅛" (11.2 x 8.6 x
2.8 cm).
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Front view of the Eveready No 145 carbon hearing aid battery showing the
model No. (145), voltage (4˝) and make (Eveready) and that it was
specifically a hearing aid battery.
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Top front view of the Eveready No. 145 carbon hearing aid battery.
Notice the 4 holes in the top of the battery into which the 4 prongs of
the carbon amplifier or battery plug fit.
This arrangement is probably unique to this battery.
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Top view of the Eveready No. 145 carbon hearing aid battery showing the
four holes (jacks).
Normally, carbon hearing aids used two jacks—one positive and one
negative. This battery has 4. The two jacks at the right and the two
jacks on the left each consist of a positive and negative jack.
It consists of 3 cells of 1˝ volts each wired in series to give 4˝
volts. Presumably, it is wired internally such that each set of jacks is
4˝ volts.
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Rear view of the Eveready No. 145 carbon hearing aid battery.
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View of the rear bottom right corner of the Eveready No. 145 carbon
hearing aid battery showing the code "E 9" stamped there.
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Bottom view of the Eveready No. 145 carbon hearing aid battery.
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