How much does electricity weight? Like if you charge your EV, does it weigh more than when the batteries are on “empty”?

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Does “electricty” or whatever it’s called that goes into your electric vehicle battery, have mass or weigh anything? My car has a 100KW battery. Is the weight substantially different when it has 0 charge versus when it is fully charged? It seems like a lot of energy goes into the battery, it must add to the net mass of the vehicle?

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Anonymous 0 Comments

Negligible but yess. based on https://physics.stackexchange.com/questions/34421/does-the-mass-of-a-battery-change-when-charged-discharged, your 100KW battery weighs 3.75×10^-8 kg less than when full.

Basically the weight of half an eyelash. (interestingly, about the same weight as the uncertainty in the kilogram before the watt balance redefinition)

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