Is this normal? I just got my Macbook Pro Retina 13.1" in November. I felt like when I first got it I could go all day basically without charging it. I work from home and use it for work. Now, I unplugged it at 6:30am when it was at 100% and now it is 8:44 and I am down to 46%. Does this sound normal to anyone? Thanks so much!!