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 E312E Mercury Hearing Aid Battery

The Eveready E312E 1.4 volt mercury battery was manufactured by the Union Carbide Corp of Cleveland, Ohio for in-the-ear hearing aids from the 1960s until mercury batteries were phased out in the USA in 1996 and were replaced by zinc-air batteries which had been available for some years at that point.

This battery weighed less than 0.5 g and measured 0.310" in diameter by 0.140" high.

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Top view of the Eveready E312E mercury battery.

The top (negative terminal) was coated with a thin shield of 24K gold for better contact (see below).
 

 

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Top rear view of the blister pak tab stating that "24K Golden Shield Provides Improved Contact".

Tabs on other blister paks left out the "24K" and just had "Golden Shield". Perhaps they used less than 24K gold at that point.


 

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Side view of the Eveready E312E mercury battery.

 


 

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Bottom view of the Eveready E312E mercury battery. The bottom and sides comprised the positive terminal of the battery.


 

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Close-up of the top front of the Eveready E312E mercury battery pak showing the battery number and voltage (1.4 volts).

Unlike most blister paks, you extracted the batteries from the top of the pak. But first, you had to tear off the cardboard tab. Then you rotated the face of the plastic case clockwise until a battery was pushed to the top and would fall out into your hand.


 

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Front view of the Eveready E312E mercury battery pak. The Eveready E312E mercury batteries were sold in blister paks of 6 batteries each.
 


 

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Rear view of the Eveready E312E mercury battery pak.


 

 


 

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