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

Duracell No. MP401H Mercury Hearing Aid Battery

The Duracell No. MP401H 1.4 volt mercury hearing aid battery was manufactured for Duracell Inc. of Bethel, CT.

The No. MP401H mercury battery weighed 0.3 oz. (8 g) and measured 1⅛" by 7/16" in diameter (2.9 x 1.1 cm).

Mercury batteries were finally phased out of use in the USA in 1996 and were replaced by alkaline batteries which had been available for some years at that point.

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Side view of the Duracell No. MP401H mercury battery showing the model number and voltage—namely, 1.4 volts.

This battery is a size "N", a popular size of battery for hearing aids used from the mid 1950s and still in use today.


 

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Top view of the Duracell No. MP401H mercury battery showing the positive terminal.

 

 

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Bottom view of the Duracell No. MP401H mercury battery showing the negative terminal.

 

 


 

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