by 
technios
ANSWERS: 4
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It should weigh the same in both instances. Electricity is generated by the completion of a chemical reaction inside the cell, but net weight should remain constant as no matter is created or lost.
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Batteries are filled with acid. When they go dead, most or all of the acid has been used. So they weigh less dead.
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Brilliant ah! ah! ah! Their both the same ,although your putting a charge into it ,the charge is weightless therefore cannot make the battery weigh more. Good question.....2nd grade are we ?
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Actually, you're all wrong :) Dead batteries do weigh *slightly* less than fully charged batteries... almost immeasurably so, but it's true. Why? The chemical reaction that "generates" electricity is exothermic - it releases heat. That's why when you short circuit a battery, it heats up quickly. During normal operation, this release of heat is much more gradual, but it still occurs. Einstein tells us that there is a relationship between mass and energy: E = mc^2. Thus, any release of energy (such as heat) will also result in a decrease in mass. Thus, dead batteries do weigh less, although normally the difference is too small to measure.
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