Is 400,000,000 tonnes as heavy as a Battery (AA)?
It's about 15,000,000,000,000 times as heavy as a Battery (AA)
The weight of a Battery (AA) is about 0.0000240 tonnes.
(Alkaline)
An "AA" size battery weighs 0.0000240 tonnes. 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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