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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

The Fortiphone No. 3-S was a 4.5-volt hearing aid battery used in carbon hearing aids in the late 1920s and the 1930s.

The Fortiphone No. 3-S carbon-zinc battery weighed 6 oz, and measured 3" high by 2½" wide by ¾" thick.

The label says it was "manufactured by Siemens Brothers & Co. Ltd (London, England)...specially for Fortiphone Limited (London).

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Top view of the Fortiphone No. 3-S battery showing the battery terminals

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The battery terminals of the Fortiphone No. 3-S were near the top center of the battery.

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