Eveready 420-E Hearing Aid "B" Battery
This
Eveready 22½ volt Mini-Max hearing aid "B" battery was used mainly in
the larger 1-piece vacuum tube hearing aids in the late 1940s and early 1950s.
It
weighed 2.5 oz. (70 g), and measured 2⅛" by 1¼" by ⅞"
(5.4 x 3.2 x 2.4 cm).
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Front view of the Eveready No. 420-E Mini-Max B battery showing the
number (420-E) in the top left corner and the voltage (22½ volts) in the
top right corner Note: there were a number of different
"Mini-Max" batteries produced with different sizes, shapes and voltages.
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Left side view of the Eveready No. 420-E Mini-Max B battery showing the
location of the negative (-) and positive (+) terminals at the ends.
The inscription reads, "An exclusive new construction gives this
"Eveready" battery exceptionally long life."
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Rear view of the Eveready No. 420-E Mini-Max B battery showing it was a
"B" battery and the positive terminal was on the left. In pencil
someone has written in the date they started using it--November 18,
1947.
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Top view of the Eveready No. 420-E Mini-Max B battery showing the
positive terminal.
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Bottom view of the Eveready No. 420-E Mini-Max B battery showing the
negative terminal. The positive and negative terminals were identical in
shape so you had to be careful not to install the battery backwards and
thus reverse the polarity.
This battery was donated to the Museum by Robert & Mary Fulton of
Glenns Ferry, ID.
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