Eveready 411-E Hearing Aid "B" Battery This is an Eveready 15 volt 411-E Mini-Max hearing aid "B" battery used in 1-piece vacuum tube hearing aids in the 1940s and 1950s. It weighed about 1 oz., and measured 1˝" by 1" by 7/8". |  | Click picture for larger view | | | | | |
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