Why doesn't MacBook Pro go to sleep when the battery is empty?

Hi there!
I was calibrating my MacBook Pro's battery and when I was running the battery down, after the point where the "Low Battery" warning popped up, it ran for 9-10 minutes and the computer just shut down. Let me mention that my battery has no problem lasting for 7 hours. What could be the issue? Is this normal behaviour?

You're just panicing - after there's no more battery reserve left, the Mac will shut down. And if you've a newer MacBook Pro with the unremovable battery, there's no reason to calibrate the battery. See http://support.apple.com/kb/HT1490. As it states:
"Portables with built-in batteries
Current Apple portable computer batteries are pre-calibrated and do not require the calibration procedure outlined in this article. These computers use batteries that should be replaced only by an Apple Authorized Service Provider."
Regards,
Clinton

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