Eveready 411E "Mini-Max" Hearing Aid "B" Battery
The Eveready 15 volt 411-E Mini-Max hearing aid "B" battery
was used in
1-piece vacuum tube hearing aids in the mid to late 1940s and early 1950s.
It weighed
0.8 oz., and measured 1 7/16" by 1" by 9/16".
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The older version of the No. 411E battery (left) and the newer version
(right) showing the cosmetic changes on the front.
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Rear view of the older and newer versions of the Eveready No. 411E battery.
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Top view of the older version of the Eveready No. 411E battery (left) and the newer version
(right). Notice that in the newer version they began color coding (red = positive)
the ends of the batteries. Color-coding helped prevent putting
batteries in backwards and thus ruining the hearing aid's electronics.
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Bottom view of the older version of the Eveready No. 411E battery (left) and the newer version
(right) showing the the color-coded (blue = negative) end of the newer
battery.
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Side view of the newer version of the Eveready 411E battery showing
the patent date of 1942.
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