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

Sonotone X65 Hearing Aid Battery

The Sonotone X65 was a 4½ volt carbon zinc battery made to be used with Sonotone's carbon hearing aids of the 1930s. It was manufactured by the Sonotone Corporation of New York.

It weighed a hefty 12 oz., and measures 4" by 3¼" by 1".



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The reverse side of the Sonotone X65. The inscription on the back reads: "How To Use: Your battery will give better results and have a longer life if used properly. . . Tests show best results are obtained if batteries are not used more than four hours continuously and then given a 24 hour rest. . . Alternate your batteries at least daily. Do not leave switch on unless you wish to use instrument. Before retiring, detach the battery from plug to insure battery rest."

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Top view of the Sonotone X65 battery showing the 3-hole socket, but only the 1st and 3rd holes were used.

The reason for the center hole is that this battery was used in a carbon hearing aid that had a carbon amplifier. Carbon amplifiers only had 2-pronged plugs. Plain carbon hearing aids (without amplifiers) had 3-pronged plugs. The 3-pronged plug normally plugged into the amplifier, and the 2-pronged amplifier plugged into the battery.

However, you could use the plain carbon hearing aid without the amplifier. In this case, you plugged the 3-pronged plug directly into the battery—hence you needed a center (dummy) hole in the battery, even though only the 1st and 3rd holes were used.

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