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Is 42,000,000 grains as heavy as a Battery (AAA)?

It's about 250,000 times as heavy as a Battery (AAA)
The weight of a Battery (AAA) is about 190 grains.
(Alkaline)
An "AAA" size battery weighs 190 grains. Batteries are named by the American National Standards Institute (ANSI) Committee C18 and AAA batteries were given their name because they were smaller than the "AA" and "A" size batteries which were invented first.
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