Ardente No. 44 Hearing Aid Battery The Ardente No. 44 was a 3-volt hearing aid battery used in carbon hearing aids in the 1930s. The Ardente Model 44 carbon-zinc battery weighed 3¾ oz, and measured 2⅝" high by 1 11/16" 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. |  | Click picture for larger view | | |   | | | |
| Front view of the Ardente No. 44 battery showing the manufacturer's name and address.
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| Top view of the Ardente No. 44 battery showing the two battery terminal prongs.
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| Left side view of the Ardente No. 44 battery showing the model number.
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| Right side view of the Ardente No. 44 battery.
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| Rear side view of the Ardente No. 44 battery showing a bit of advertising there.
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| Front view of a later version of the Ardente No. 44 battery showing the manufacturer's name.
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| Rear view of a later version of the Ardente No. 44 battery showing the addresses of the main office and the locations of the various branches.
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| Right side view of a later version of the Ardente No. 44 battery showing the model number.
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| Left side view of a later version of the Ardente No. 44 battery showing the words "British made" and a place to put the date the battery was put in use.
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| Bottom view of the Ardente No. 44 battery.
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