Hugh Hetherington Hearing Aid Museum
Hugh Hetherington Hearing Aid Museum

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.

 

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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Back

 
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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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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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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