No. 630 Mercury Hearing Aid Battery
The No. 630 1.4 volt mercury hearing aid battery was made by an
unnamed manufacturer. It was used in behind-the-ear and eyeglass hearing aids in the
mid 1950s.
The No. 630 mercury battery had a capacity of 350 mAh and weighed 0.17
oz. (3 g) and measured 0.238" high
by 0.615" in diameter (0.55 x 1.5 cm). |
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Top view of the No. 630 mercury hearing aid battery showing the negative
(-) terminal of
the battery.
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Side view of the No. 630 mercury hearing aid battery.
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Bottom view of the No. 630 mercury hearing aid battery showing four patent numbers. The bottom was the positive terminal
(+) of
the battery.
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