When battery being calibrated fully depletes, can I swap out for another?

My question is about calibrating a battery, based on Apple's instructions (http://support.apple.com/kb/HT1490).
I have two batteries for this computer.
When I'm calibrating one of them, and get to steps 4 and 5, and the computer has shut down, does the battery being calibrated need to remain in the computer, thus rendering the computer effectively out of service for the five hour duration? Or can I take it out, and either use the computer from AC power or another battery?

It's best to leave it in during forced sleep yes. The idea is to drain the battery as low as possible - after the MBP is goes into forced sleep, it's still pulling charge from the battery to power the RAM. After a while in that state, though, the MBP often powers off completely. If that occurs before the end of the 5 hour hold period, it's fine to pull the battery and use the other, then shut the MBP off, put in the discharged battery, and connect to AC before charging to full/

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When battery being calibrated fully depletes, can I swap out for another?

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