Correction for the weight of a Battery (D)
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How heavy is 645.50 miligrams?
It's about one-two-hundredth as heavy as a Battery (D)
The weight of a Battery (D) is about 135,000 miligrams.
(Alkaline)
A "D" size battery weighs 135,000 miligrams. The D size battery is the oldest of the modern battery sizes, first invented by the National Carbon Company in 1898.