Before, when i would close my mac book and not have the power adapter attached, the battery would stay the same. But now, it uses up all my battery. None of my preferences have changed (i think) i have the sliders set to 'never' for display and computer to sleep but i dont think thats the problem. The internet connection gets cut off when i close the lid but all the power gets sucked out for some reason. Would this be be a problem with the battery or just a setting thats changed?