Eveready E401E Mercury Hearing Aid "A" Battery This is an Eveready 1.4 volt mercury hearing aid "A" battery used in the vacuum tube and transistor hearing aids in the 1950s. This battery weighs about ˝ oz., and measures 1 1/8" by ˝" 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 | | | | | | |
| The same sized battery made by Duracell. They called theirs the RM401H.
|  | Click picture for larger view | | | |
| The same battery, but made by Ray-O-Vac was called the R-401). |  | Click picture for larger view | | | |
| Zenith got into the act and called their battery the ZM401. |  | Click picture for larger view | | | |
| Not to be left out, Beltone called their version of this battery the BP401R. |  | Click picture for larger view | | | |
| Battery box for Mallory RM-401H batteries. This box holds 2 of the above sized batteries.
|  | Click picture for larger view | | |
|
(If a larger picture doesn't appear, you may have to
turn your pop-up blocker off)
|
| |
