Acousticon Model 11 Lead-acid Hearing Aid Battery This 2-cell 4 volt Acousticon Model 11 lead-acid rechargeable battery was made for Acousticon's carbon hearing aids during the 1930s by Dictograph Products, Inc. New York. When filled with water/acid, this battery weighed about 12 oz. It measures 4˝" by 2˝" by 7/8". The case was made of a clear Plexiglas or plastic-type material. |  | Click picture for larger view | | | | | |
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