Hi, I've been having concerns about my battery life for a couple of days now. On a rMBP that's supposed to handle 9 hours of battery life, I was only getting about 3 or 4 hours. I had to charge my macbook as if it was my iphone (you can imagine)... Today I open up my macbook (left it at 96% the last time I used it) and it had 75% left of battery. I do some web browsing and leave it open for like 10 minutes. When I come back and wake it up from sleep, I only have 12% of battery left! THAT IS CRAZY! Now I'm really skeptical about what's going on. Please if someone has encountered the same problem give me a solution! Is it Mavericks or what?