Acousticon 57 Hearing Aid Battery
This
is an Acousticon 57 "Double Duty" battery that was used in
some Acousticon carbon hearing aids."
Most carbon hearing aids used either 3 or 4˝
volts batteries—but this one has 4 cells. Therefore, the question is
what they meant by "double duty". Either it was wired in series for 6
volts , or in series-parallel for 3 volts with double the capacity.
It weighed 1 pound, 1 oz., and measured 4"
by 1" by 3⅞" high.
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