Toshiba NR48 Mercury Hearing Aid Battery
The Toshiba No. NR48 1.4 volt mercury hearing aid battery was made by
Toshiba Corporation of Tokyo, Japan, probably in the 1970s.
The Toshiba No. NR48 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).
This battery size is commonly called a No. 13. 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 Toshiba No. NR48 mercury hearing aid battery
showing the positive terminal polarity indicator (top) the model
number (NR48) and the name "Toshiba" (middle), and
that it was made in Japan (bottom).
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