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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. | | Zinc-air Button Hearing Aid Batteries Here are the modern zinc-air button-type hearing aid batteries for behind-the-ear and smaller transistor hearing aids. From left to right are sizes 10 (yellow tab), 312 (brown tab), 13 (orange tab), and 675 (blue tab). Missing is the tiny Number 5 battery (red tab). |  | Click picture for larger view | | | |
| | | Size comparison of the RM-1 and RM-4 mercury batteries with today's zinc-air batteries—sizes 10, 312, 13, and 675 respectively.
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