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How does that compare to the energy density in common lithium ion batteries like the 18650? Why is it measured power unit area, and not volume?

Because size matters! If a manufacturer is willing to pay 10¢ more for a thinner battery that can stay alive as long as the one they used in their last model, well, someone is gonna do the research beforehand so they can try to capitalize on the tech.

Uhh, sure, but the thickness still matters. Your capacitance comes from the volume, not the area. If they're going to measure density in terms of area, they should specify the thickness. Or just divide by it and give the measurement in terms of volume, then people can directly compare technologies.

Why would they want people to be able to do that and weaken their funding generating hype machine?

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> ... prevented the infinite volume change ...

You gotta watch that infinite volume change. The last time that happened a universe appeared.

cough *teeny verse *

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Weird to have battery energy density per area. The number I work with for high performance Li batteries is 450 Wh/kg. Usually when people use weird units they are trying to obscure that the result isn't that good.

> Uhh, sure, but the thickness still matters.

Definitely, I've been told multiple times that it matters more than length.

Another day another battery breakthrough that never materialises.