450 Mercury Hearing Aid Battery
The No. 450 1.4 volt mercury hearing aid battery was used in some
vacuum tube hearing aids in the early 1950s as the "A" battery, and in
some early transistor hearing aids around 1953-1955.
The No. 450 mercury battery weighed 0.18 oz. (4 g), and measured
0.570"
thick
by 0.455" in diameter (1.4 x 1.1 cm).
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The No. 450 mercury battery came in at least a couple of colors,
probably made by different manufacturers. The one at the top has a blue
insulator separating the positive and negative terminals. The one at the
right has a steel gray colored insulator.
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Side view of the No. 450 mercury battery. The outside of this battery is
all the positive terminal.
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Top view of the No. 450 mercury battery showing the negative terminal
(center) and the blue insulator.
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Top view of the second No. 450 mercury battery showing the negative
terminal (center) and the steel gray insulator.
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Bottom view of the "blue" No. 450 mercury battery showing the model
number (450) and "+" positive terminal indicator (center). The other
numbers refer to various patents.
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Bottom view of the "gray" No. 450 mercury battery showing the model
number (450) at the top and "+" positive terminal indicators (left and
right). The number at the bottom is the patent number.
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