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Yup, the X250 reports 2 batteries in Linux... both of the same capacity, and only one is removable the other is built-in somewhere.
I like the way it drains too... always the slot-in battery first, then the built-in.
Great advantages are that you can hot-swap batteries whilst not being on power. You can even take the battery out and stow it in check-in luggage and still have enough battery built-in to watch a movie on the plane.
The only thing the X250 didn't solve were the Home/End/Delete keys and the lack of media keys on the arrow keys. But you know what... when that is my only complaint then I'm damn happy.
Oh yes, plus he X250 has much more battery squeezed in too, right? Another one of that dude's main complaints resolved with the X250.
The X250 really seems like a big improvement in comparison to the "modern" ThinkPads that came before it.