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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. | | Siemens S109 Hearing Aid "B" Battery This is an Siemens 45 volt "B" battery that fit a number of English-made vacuum tube hearing aids in the 1940s. It weighed 8 oz., and measured 4" by 2˝" by 1". |  | Click picture for larger view | | | | | | | | This battery sometimes was paired with the S18 "A" battery (right).
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