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Why don't we have A- and B-size batteries? | Almanac.com

Why don't we have A- and B-size batteries?

Question
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Why don’t we have A- and B-size batteries?
Answer
Big A- and B-size batteries were used in early radios and crank telephones. They are now obsolete. Originally, A was the smallest, then AA and AAA. Now even a AAAA-size battery is available.