Replacing battery in sleep shuts down Mac...?

Is not the battery hot swappable? I let the comp go to sleep by putting the screen down and waiting for the light to flash. Then I swap out the battery and then have to turn the whole thing back on.
Is this right?
Oh and it happens whether the battery is dead, dying, or both fully charged.
Thanks!!

Read this article: http://docs.info.apple.com/article.html?artnum=303329.
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