Mallory RM-12 Mercury Hearing Aid Battery
The Mallory RM-12 1.4 volt mercury battery was used in some body-worn
vacuum-tube and transistor hearing aids starting around 1950 to about 1959. It weighed 1.4 oz., and
measured
1 15/16" high by
⅝" in diameter. 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 |
| |
 
|
| |
|
|
Side view of the Mallory RM-12 mercury battery. It looked like a button
battery on steroids. The extra capacity was needed in some early
transistor hearing aids, although many used the more common
"N" sized (401) battery.
|
 |
Click picture for larger view |
| |
|
|
Top view of the Mallory RM-12 mercury battery showing the negative
terminal.
|
 |
Click picture for larger view |
| |
|
|
End view of the Mallory RM-12 mercury battery showing the model number,
positive terminal "+" sign and the patent number.
|
 |
Click picture for larger view |
| |
|
|
Bottom view of the Mallory RM-12 mercury battery showing the positive
terminal.
|
 |
Click picture for larger view |
| |
|
(If a larger picture doesn't appear, you may have to
turn your pop-up blocker off)
|
|
|
