Zenith No. RT Hearing Aid Battery This is an Zenith No. RT 1½ volt carbon-zinc battery for body worn transistor hearing aids. It was sold by Zenith dealers for use in the Zenith transistor hearing aids of the 1950s. It is slightly larger than our "AA" size batteries today. It weighs ¾ oz., and measures 1 7/8" by 5/8" in diameter. |  | Click picture for larger view | | | | | |
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