When I get to about 6%, it tells me that it's on low battery. If I let it go to 0%, it just shuts down completely. My ibook just went to sleep when the battery was at 0%. Did they downgrade this feature or does my MBP have a problem? I'm on the phone with Applecare right now and she says it's normal. I said no and she went to "research" the problem. Is it normal?