For those who have a 2011 Macbook Pro and had or may still have Snow Leopard what kind of battery did you get in the beginning at best? I'm asking as my wife's 2011 Macbook Pro 17" on Snow Leopard use to get between 7-8 hours. Now on Mavericks she gets around 4.0 to 5 hours. Now mind you she has 89% of her battery's mAH battery life still left as she doesn't use the laptop too often. It just seems like Snow Leopard had better battery life then Mavericks let alone Yosemite from what I can see.