On-line Hearing Aid Museum

Hearing Aids of all types—Ear Trumpets, Carbon Hearing Aids, Vacuum Tube Hearing Aids, Transistor Hearing Aids, Body Hearing Aids, Eyeglass Hearing Aids and much more!

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General Info

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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

Ardente No. 77 Hearing Aid Battery

The Ardente No. 77 was a 3-volt hearing aid battery used in carbon hearing aids in the 1930s.

The Ardente Model 77 carbon-zinc battery weighed 3¾ oz, and measured 2⅝" high by 1⅝" wide by 13/16" thick.

The label says it was "specially made for use with Mr. R. H. Dent's Ardente for Deaf Ears" hearing aids.

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Left side view of the Ardente No. 77 battery showing the model number.

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The Ardente No. 77 battery had springy brass battery terminals to make firm contact.

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Top view of the Ardente No 77 battery showing the positive terminal (+) on the left.

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