Just wondering if this is normal or not? My battery % seems to be stuck at 90% at full and refuses to charge any more. I've tried letting the battery drain to like 0% then charge it back up, but still won't go any higher than 90%. Battery life is still okay, I think. Still getting 5-6 hours of surfing on the web with 3/4 brightness. MBP 13" 2011 is only 6 days old.