Eveready 412E Hearing Aid "B" Battery
This
is an Eveready 22½ volt Mini-Max hearing aid "B" battery used mainly in
the larger 1-piece vacuum tube hearing aids in the 1940s and 1950s.
It
weighed 1¼ oz., and measured 2" by 1" by ½".
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This Eveready model 412E battery came in a cardboard sleeve.
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When slid out of the sleeve, this Eveready model 412E battery has
absolutely no markings on it. Perhaps the sleeve materials caused the
ink to disappear.
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Another Eveready model 412E battery with the faintest markings showing
it was indeed an Eveready 412E battery of the above design.
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The earlier (no name visible) battery (center) beside the sleeve (left)
and a newer Eveready model 412E battery.
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Although the same model, this newer version of the 412E battery has a
slightly different positive
terminal (bottom).
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Ad in the Saturday Evening Post, January 22, 1949, showing the Eveready 412E 22½ volt "B" battery (right). Back then,
this battery sold for $1.05. It is shown paired with the then new (and
revolutionary) 1½ volt "A" battery— the Eveready 1005E "air
breathing" battery.
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