Rayovac R-401 Mercury Hearing Aid Battery
The Rayovac R-401 1.4 volt mercury hearing aid battery was made by Rayovac Corp of Madison, WI.
It was used in transistor hearing aids
around 1966. It was largely replaced by the
heavy duty version of this battery, the
Rayovac RP401.
The R-401 battery weighed 0.4 oz. (11 g) and measured 1⅛" by
7/16" in
diameter (2.8 x 1.2 cm). Mercury batteries of this size were known as "N" batteries.
Mercury batteries
are no longer sold today because of the large quantities of mercury in
them, and the consequent environmental concerns.
This battery was equivalent to the Beltone BP401R, the
Duracell RM-401H, the
Eveready E401E
and the Zenith ZM401
and a number of others.
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