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    $\begingroup$ "batteries are heavier than the same amount of fuel" – That's only part of the problem. The problem is compounded by the fact that, unlike fuel, they stay heavy as they are depleted. That's why, for example, Rocket Labs mounts the batteries on the outside of the Electron rocket and drops them to burn up in the atmosphere as soon as they are empty. $\endgroup$ Commented Sep 6, 2020 at 14:23