Mallory TR-136R Mercury Hearing Aid Battery
The Mallory Duracell TR-136R 8.1 volt mercury battery was used in an
auditory trainer somewhere around 1970. It weighed 2.8 oz., and
measured
3 15/16" high by
⅝" in diameter. Mercury batteries are no longer sold today
because of the large quantities of mercury in them and the consequent
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Side view of the Mallory TR-136R mercury battery showing the model
number, voltage and positive and negative terminals. 8.10 volts was an
unusual figure. If this battery was made up of six 1.4 volt cells the
voltage should have been 8.4 volts.
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Opposite side of the Mallory TR-136R mercury battery showing the manufacturer
(Mallory Duracell) and that it was a mercury battery.
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Top view of the MalloryTR-136R mercury battery showing the negative
terminal.
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End view of the Mallory TR-136R mercury battery showing the model number,
positive terminal "+" sign and several patent numbers. These
patents were approved between 1951 (Pat. No. 2542575) and 1955 (Pat. No.
2712565). The "1" may indicate the
diameter class as the Mallory RM-1 battery was ⅝" in diameter also.
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Bottom view of the Mallory TR-136R mercury battery showing the positive
terminal.
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