Hugh Hetherington Hearing Aid Museum
Hugh Hetherington Hearing Aid Museum

The Hearing Aid Museum

Hearing Aids of all types—Ear Trumpets, Carbon Hearing Aids, Vacuum Tube Hearing Aids, Transistor Hearing Aids, Body Hearing Aids, Eyeglass Hearing Aids and much more!

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Click on the "General Information" button (top button above) for an overview and general information on this category of hearing aid.

 

Hearing Aid Batteries

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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