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0.000000000200 megatonnes is about one-and-a-half times as heavy as a Battery (D)
In other words, it's 1.480 times the weight of a Battery (D), and the weight of a Battery (D) is 0.6760 times that amount.
A "D" size battery weighs 0.0000000001350 megatonnes. 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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