Hello guys! I have a MBP 13' 2011 for like a month,but I've been experiencing some battery lack. It only lasts for 4 hours with normal use! and with wireless and bluetooth off, brightness on the minimum and few apps running I only get 6 hours! It isn't normal. So my doubt is: How long does your MBP runs with wireless off, bluetooth off and brightness on the minimun? As well as in light use, normal use and heavy use. Thanks!