Gem No. 1A Hearing Aid Battery
The Gem No. 1A was a 3-volt hearing aid battery used in Gem carbon hearing aids
starting in 1930.
The Gem No. 1A carbon-zinc battery weighed 7.3 oz, and measured
3˝" high
by 2⅛" wide by 1" thick.
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The battery terminals of the Gem No. 1A, instead of being in the
center, were near the back edge of the battery.
This provided better stability for hearing aids like the
Gem "Standard"
since the microphone for that aid was "front heavy".
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