Exchanging Battery on Macbook Pro without loss of data

Hi all,
I know that when I close the screen on my MBP it is supposed to go to safe sleep AKA hibernate and I should be able to swap batteries. Then on starting it back up, it should go back to the state it was at when I closed the screen.
Now, when I swap batteries, the computer just dies and I have to do a brand new restart. Any ideas?

I guess I didn't make myself clear enough:
I KNOW that I can just shut my computer off and switch batteries and turn it back on. The reason why I want to switch batteries is because on long flight, you guessed it, one will run out of juice and I have a spare one.
Powering down and back up takes time and makes noise. I know for a fact that it is possible to keep the computer in sleep (starts up faster again, right?) while swapping the batteries. It worked for my powerbook, it USED TO WORK for my MPB and it works according to the how to section.
My question is: If it's supposed to work, and it used to work, how can I make it work again?
Not: How do I switch out a battery?

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