Unknown Carbon Hearing Aid Battery (5)
This unnamed carbon-zinc 3-volt hearing aid battery was used in
carbon hearing aids around 1921.
Although it is unnamed, it is identical to the
Globe No. 5 carbon-zinc battery, and is
of a similar vintage.
This battery measured 3 9/16" x 2 3/16" x 1⅛" (9.1 x 5.5 x 2.9 cm).
It weighed 6˝ oz (184 g).
The pin spacing was exactly 1" (2.5 cm). Note that the pins are
of uneven diameter. The right pin is thicker
(⅛") than the left pin (3/32") in order to preserve correct polarity.
Having the right pin thicker than the left pin was very unusual.
Almost all other batteries were the reverse with the larger pin on the
left.
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