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42,000,000 grains is about 20,000 times as heavy as a Battery (D)
In other words, it's 20,200 times the weight of a Battery (D), and the weight of a Battery (D) is 0.00004950 times that amount.
A "D" size battery weighs 2,080 grains. The D size battery is the oldest of the modern battery sizes, first invented by the National Carbon Company in 1898.
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