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Man, every time great new technology comes along you guys have to come in and bust it all up with your logic and reason :)

That graph shows Li-ion as the highest energy density, which is in accord with the article. What am I missing?

The trend. The point is that energy densities are improving steadily, contrary to the article.

Which is a bit moot because, going by the trend, it's not until ~ the year 2220 that batteries will equal petrol for energy density by weight.

Hmm, didn't know there is a Palladium acid battery.

Not sure if that's the joke flying over my head, but I believe that's a typo, and should be Pb (i.e. lead) acid.

I realised it was a typo, I was just being facetious.