Zenith Z-6B Hearing Aid "B" Battery This is a Zenith 22˝ volt hearing aid "B" battery equivalent to the Eveready 505-E. It was sold by Zenith dealers to be used in the Zenith 1-piece hearing aids of the 1940s and 1950s. The Z-6B weighed about 1 oz., and measured 2" by 5/8" by 5/8". |  | Click picture for larger view | | | | | | |