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That's for extended battery used together with the regular battery.

Ah, the fine print.

I just feel if this was just the actual battery, we would have heard a bigger announcement!

15 hours (claimed) with the regular 9 cell battery. Not too shabby.

battery life > battery life while actually using computer.

The * often states it;s without wifi on and at 50% screen brightness, so that's pretty much the same thing.

I think it's with an external battery slice.

Is that some briefcase-sized device you strap to your notebook with bungee cords?

It's a thin battery pack that attaches to the bottom of the laptop and works in conjunction with the system battery.