No. 13R Mercury Hearing Aid Battery
This No. 13R 1.4 volt mercury hearing aid battery was made by an
unknown manufacturer in England, probably in the 1970s.
The No. 13R mercury battery measured 0.305" in diameter by
0.208" thick (0.78 x 0.5 cm) and weighed 0.02 oz. (0.5 g).
The No. 13 battery was quite thick as compared to its diameter,
unlike most other button batteries.
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Bottom view of the No. 13R mercury hearing aid battery showing the
model number (13R) at top, the positive terminal polarity symbol (center) and
that it was made in England (bottom).
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