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| 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! | | | |
| Click on the "General Information" button (top button above) for an overview and general information on this category of hearing aid. | | Sonotone X800 Hearing Aid "A" Battery This is an Sonotone X800 1½ volt hearing aid "A" battery used in Sonotone vacuum tube hearing aids in the 1940s. It weighed 4½ oz., and measured 3¾" in height by 1" in diameter. This battery was paired with a Sonotone 45 volt "B" battery in 2-piece vacuum tube hearing aids. |  | Click picture for larger view | | | | | | | | This battery is a slightly different version of the above battery. It is a Sonotone X800-S, but it is the same size and weight as the above X800 battery. Someone has written on the side the date of Nov. 22, 1945. |  | Click picture for larger view | | | | | Top view of the Sonotone X800-S battery showing the 2-hole socket. Correct polarity was maintained as one hole was larger and the other smaller so you couldn't insert the plug backwards. |  | Click picture for larger view | | |
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