• 0x4E4F
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    1 year ago

    Battery-electric is a way to move power. You still need to generate power in the first place - and perpetual motion would be great for the grid, for ships, everything. It just doesn’t work.

    I wasn’t talking about perpetuum mobile, I was talking about the magnets actually spending their magnetic energy… you would have to magnetize them again from time to time.

    Nice comic BWT, funny 😂.

    • SomeoneSomewhere@lemmy.nz
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      1 year ago

      If you genuinely use the magnets as a battery, they just don’t store enough energy. Wikipedia lists Neodymium magnets as storing about 512kJ/m^3, and lead-acid batteries as about the same amount but per litre - so a thousand times more dense.

      Remember that energy removed must equal energy added, so you need to find a way to pump those megawatt-hours into the battery.

      In addition, energy storage mechanisms generally have to release that same amount of energy when destroyed. A fully charged lithium battery makes a serious fire, especially if it’s a big one. A big tank of petrol makes a big fireball, when allowed to mix with air. A spring or a magnet mostly just goes ‘bang’.