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0.021 kilograms is about nine-tenths as heavy as a Battery (AA)
In other words, it's 0.880 times the weight of a Battery (AA), and the weight of a Battery (AA) is 1.10 times that amount.
(Alkaline)
An "AA" size battery weighs 0.024 kilograms. AA batteries came into common use during World War II and were given their name by the American National Standards Institute (ANSI) Committee C18 because they were smaller than the "A" size batteries which were invented first.
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