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!

FREESubscriptionto:
Hearing Loss Help
The premier e-zine for people with hearing loss

Your email address
will never be
rented, traded or sold!

Your First Name:

Your E-mail:

General Info

Non-Electric

Carbon

Vacuum Tube

Transistor (Body)

Transistor (Ear)

Cochlear Implants

Miscellaneous

For Sale

Search this site:

Results per
page

all words

any words

Click on the "General Information" button (top button above) for an overview and general information on this category of hearing aid.

Hearing Aid Batteries

Eveready RM-1, 3 & 4 Mercury Hearing Aid "A" Batteries

At the right is an RM-1 1.4 volt mercury hearing aid "A" battery used in the vacuum tube and transistor hearing aids in the 1950s.

The RM-1 mercury battery weighed about ½ oz., and measured ⅝" high by ⅝" in diameter.

The larger RM-3 weighed about 1 oz. and was 1" in diameter. The largest of the series, the RM-4 weighed about 1½ oz. and was 1 3/16" in diameter. All 3 sizes are the same length—namely ⅝".

The General Dry Battery Company produced the RG-1, which was identical in size to the RM-1 battery.

Mercury batteries are no longer sold today because of the large quantities of mercury in them and the consequent environmental concerns.

Click picture for larger view

The picture at the right shows the three sizes of the RM mercury battery series. From left to right they are the RM-4, RM-3 and RM-1. There doesn’t appear to have been an RM-2 battery used in hearing aids.

Click picture for larger view

Battery box for Mallory RM-1 batteries. This box holds 4 RM-1 batteries.

Click picture for larger view

(If a larger picture doesn't appear, you may have to turn your pop-up blocker off)