Sonotone No. 600 Hearing Aid Battery
This
is an Sonotone No. 600 2.8 volt mercury hearing aid battery used in the
Sonotone
Model 200 transistor body hearing aids that came out in 1956.
It weighed 1⅛ oz., and measured
1¼" in height by 1" wide x ½" thick.
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Side view of the Sonotone No. 600 battery showing the model number. The
Sonotone No. 600 was equivalent to Eveready's No. E122E and Duracell's
No. TR122H batteries. |
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Top view of the Sonotone No. 600 battery showing the double cell
arrangement. The positive terminal is the rectangular pad and the negative
terminal is the round one (top). |
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Bottom view of the Sonotone No. 600 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.
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