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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