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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