Eveready 703 Hearing Aid "A" Battery The Eveready 703 battery was technically a flashlight battery. However, it also could be used in certain vacuum tube hearing aids such as some Amplivox models that required a 4˝ volt "A" battery. The battery measured 2˝" high by 2˝" wide by 13/16" thick. It weighed 4 oz. This battery was used in the late 1930s and early 1940s.
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