Hearing Aid Battery Testers—General InformationTesters for hearing aid batteries have been around almost as long as the hearing aids themselves. Since the hearing aid batteries were often rotated from day to day, it was a good idea to check the voltage before connecting it to aid. Many of the hearing aid manufacturers had battery meters made for them with their own brand name. The early ones for carbon hearing aids measured up to 4.5 or 6 volts, while the models used for vacuum tube aids were often dual range voltage testers with one range up to 1.5 Volts for the "A" battery and up to 45 Volts for the "B" battery. Since the carbon hearing aids required low voltage batteries, there were a few testers that used only a small light bulb to test the battery in a similar fashion that we use an LED in some testers today. Battery testers are still available today for the small button cells used in BTE and ITE hearing aids. |  | Click picture for larger view | | | Example of a Hearing Aid
Battery Tester Click on the "Miscellaneous"
button (on the left), then on "Hearing Aid Battery Testers" to see the details of this and other hearing aid battery testers. | | |   | | |
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