Quick Fact: Household battery sizes were standardized in the 1920s. The naming…

Household battery sizes were standardized in the 1920s. The naming system used was simple: A, B, C, and D. As energy density improved, smaller batteries became useful, so we needed more names. Since there’s no letter before A, “AA” and “AAA” were used.. Ref: mentalfloss.com/article/12325/why-arent-there-b-batteries

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