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Click on the "General Information" button (top button above) for an overview and general information on this category of hearing aid.

Hearing Aid Batteries

This No. 520 1.4 volt mercury hearing aid battery was used in transistor hearing aids in the mid-1950s.

The No. 520 mercury battery weighed about 1 gram, and measured ¼" high by 7/16" in diameter.

Mercury batteries are no longer sold today because of the large quantities of mercury in them and the consequent environmental concerns.

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The reverse side of the No. 520 mercury battery.

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The No. 520 battery (left) compared in size to a Canadian quarter.

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