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| 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! | | | |
| Click on the "General Information" button (top button above) for an overview and general information on this category of hearing aid. | | General EP-901 Hearing Aid "B" Battery The General EP-901 22½ volt "B" battery was used in the 2-piece vacuum tube hearing aids of the 1940s. It was often paired with an EP-728 "A" battery which was of similar shape and size. This battery was manufactured by the General Dry Battery Co. It weighed 4¼ oz., and measured 4 1/8" in height and 1 1/8" in diameter. |  | Click picture for larger view | | |   | | | | | The top view showing the battery socket. Notice that this "B" battery has a 3-pin socket, whereas the EP-728 "A" battery only had two pins.
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