Medresco (Ministry of Health) OL-419 Hearing Aid Battery
The Ministry of Health in the United Kingdom provided batteries for
users of their Medresco (Medical Research Council) vacuum tube hearing
aids in the 1950s.
This 1˝ volt carbon-zinc battery
weighed 0.5 oz. (14 g), and measured 1 15/16" in height by 9/16" in diameter
(5.0 x 1.4 cm.
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Front view of the Medresco (Ministry of Health) OL 419 battery showing
the crown logo, the Ministry of Health name and the model number (OL
419).
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Side view of the Medresco (Ministry of Health) OL 419 battery. Note that
the batteries issued by the Ministry of
Health were manufactured by the Eveready Co. (G.B.) Ltd. The arrow
points to the positive terminal (top of battery).
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Rear view of the Medresco (Ministry of Health) OL 419 battery. It reads,
"Government property, for use with Medresco hearing aids only.
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Top view of the Medresco (Ministry of Health) OL 419 battery showing the
red end with the positive terminal in the middle. For some reason the
cardboard wrapper extended past the top of the battery.
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Bottom view of the Medresco (Ministry of Health) OL 419 battery
showing the negative terminal.
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