Battery empty at 1% or even 0% but no automatic sleep happening

I wanted to calibrate my macbook pro to optimize the battery usage because i always use my mac at school.
But then I noticed that whenever my battery empties at 1% or 0% nothing happens. My mac doesn't turn off by itself, or even the display won't sleep. Why is this? Is there something wrong?
On the system preferences: My mac will eventually sleep on battery after 15 minutes. But it doesnt.. what settings should I change?
Before my battery will only take like 10% and the pop up for "your computer is running low" then i will completely empty my battery and my mac turns off or i dont know..sleep by itself - but right now its not happening.
thanks for the help

Welcome to Apple Discussions. We are on same boat. this might be helpful to you.
http://discussions.apple.com/thread.jspa?threadID=2416586

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