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

625 Mercury Hearing Aid Battery

This is an 625 1.4 volt mercury hearing aid battery used in a few transistor hearing aids in the 1950s.

The 625 mercury battery weighed about 0.1 oz., and measured 3/16" high by ⅝" in diameter.

Mercury batteries are no longer sold today because of the large quantities of mercury in them and the consequent environmental concerns.
 

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Top view of a Number 625 battery. From this view it looks much like a 675 battery.


 

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Side view of a Number 625 battery showing its "mushroom" shape with the top part larger than the bottom.


 

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Bottom view of a Number 625 battery showing its number. This one was made in the United Kingdom.


 

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Bottom view of another Number 625 battery showing its number. This one was made in the United States.


 

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Picture of a Number 625 battery (left) beside a Number 675 battery (right) showing the difference in size.


 

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Top view of a Number 625 battery showing its size. (Each mark on the ruler is 1/16".)

 


 

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