Drive your car until the tank's empty, and it will probably be 100 pounds lighter (minus the 6 extra Red Bulls consumed). But drive an electric car until it's out of juice, and on a much smaller scale, it will also have shed weight.
Whether or not batteries get lighter as they lose energy is a question that has vexed Yahoo Answers since amateur physicists first found the internet. So to settle the question, YouTuber Tom Scott tracked down half a dozen renowned professors (and a Tesla Model S). Their answer? A dead battery is lighter than a charged one, but on a microscopic scale.
As Scott explains, the mass lost is equivalent to the battery's energy, divided by the speed of light squared (we know this thanks to e=mc^2). Anything divided by the speed of light squared is going to be an unfathomably tiny number — in this case, less than the weight of the rubber burned off the tires.
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Source: Electric Cars Are Ever So Slightly Lighter With Dead Batteries
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