Hugh Hetherington Hearing Aid Museum
Hugh Hetherington Hearing Aid Museum

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

 

Hearing Aid Batteries

Mallory M-505 Carbon-Zinc Hearing Aid "B" Battery

The Mallory M-505 22˝ volt carbon-zinc hearing aid "B" battery was manufactured by the Mallory Battery Co in the USA. It was used in vacuum tube hearing aids around 1950.

The M-505 carbon-zinc battery weighed 0.6 oz. (16 g), and measured 2" long by ⅝" on each side (5.0 x1.6 cm).

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Front view of the Mallory M-505 battery showing the model number (M-505) and voltage (22˝ volts).

 

 

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Side view of the Mallory M-505 battery showing the polarity. The positive terminal was at the top.

 

 

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Top view of the Mallory M-505 showing the positive battery contact.

 

 

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Bottom view of the Mallory M-505 showing the negative battery contact.

 

 


 

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