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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! |
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Click on the "General
Information" button (top button above) for an overview and general
information on this category of hearing aid. |
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Hearing Aid Battery Testers |
Rayovac Model HT-14 Hearing Aid Battery Tester
The Rayovac Model HT-14 hearing aid battery tester was made for the
Rayovac Corporation of Madison, WI in 1985. (On the back of the meter
(inside) is the date of Jul 11, 1985 which accurately dates this battery
tester.)
It was designed to test carbon-zinc, alkaline, mercury and silver button batteries
in common use at that time.
The Rayovac Model HT-14 battery tester measured 4" x 2⅞" x 1
11/16"
(10.2 x 7.3 x 4.3 cm) and weighed 4.7 oz. (134 g).
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Click picture for larger view |
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Close-up view of the Rayovac HT-14 hearing aid battery tester showing
the meter on the left. The meter was easy to read. If the needle remained in the red, the
battery needed to be replaced. If it was in the green, the battery was
still good.
The switch on the upper right selected one of there kinds of
batteries to test. The left position was for testing 1.35 volt mercury
batteries. The center position was for testing 1.5 volt silver
batteries, and the right position was for testing 1.5 volt alkaline and
carbon-zinc batteries.
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Click picture for larger view |
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To test a battery you either placed the positive terminal (bottom) of
the battery on the metal "button" (bottom right) and touched the black
probe to the top (negative) terminal, or you touched the red (positive)
probe to the positive terminal of the battery and the black (negative)
probe to the negative side of the battery. |
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Click picture for larger view |
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Rear view of the Rayovac HT14 hearing aid battery tester showing the
Electro-Specialties, Inc. label for service and repair on this meter. The
Model No. (HT-14) is in the top line of the label.
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