Sonotone No. 650 Hearing Aid Battery
This
is an Sonotone No. 600 2.8 volt mercury hearing aid battery used in the
Sonotone
Model 1111 transistor body hearing aids that came out in 1953.
It was manufactured by Sonotone Corp. of Elmsford, NY.
It weighed 0.8 oz. (28 g), and measured
1¼" in height by 1" wide x ½" thick (3.1 x 2.5 x 1.3 cm).
According to
this invoice,
it sold for $1.50 in 1962.
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Front view of the Sonotone No. 650 battery showing the patent number
(2422045) which was filed in 1945 and issued in 1947. The battery was
installed in the hearing aid correctly if it looked just like this—the
writing right side up and the arrow pointing to the right.
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View of the backof the Sonotone No. 650 battery.
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Side view of the Sonotone No. 650 battery showing the model number
(650). This battery looks the same as the model 600. Perhaps it has a
higher capacity than the model 600. |
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Front and top view of the Sonotone No. 650 battery showing the polarity
of the two terminals. The round terminal has a negative polarity, while
the rectangular terminal has a positive polarity. |
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Top view of the Sonotone No. 650 battery showing the double cell
arrangement. The positive terminal is the rectangular pad and the negative
terminal is the round one. The two cells were wired in series to give
2.8 volts |
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Bottom view of the Sonotone No. 650 mercury battery showing the
single positive terminal on the bottom of one cell. With this
arrangement, the battery could provide both 1.4 volts and 2.8 volts at
the same time, except that the positive terminal is coated with a clear
plastic resin so it can only be used as a 2.8 volt battery. This
arrangement works for the Sonotone 1111 hearing aid of 1953 which
doesn't require the split voltage like the Sonotone 200 hearing aid of
1956 does.
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