Is it me or does Late 2011/Early 2012 13" Macbook Pro battery runs fast not being on the charger? I've realized when I'm on youtube or not even being on youtube. But just having some tabs open such as: Mac Rumors, Facebook, tumblr and email. It runs from being 4hrs30minutes or something to 1hrs/2hrs hours even 50 minutes left. I'm not that worried but I just noticed it now.