Im looking at the Macbook Pro refurbished store and I see that the 2012 15" 2.3 GHz 8GB ram is 1599 while the 2013 15" 2.4 GHz 8GB is $1850. I understand that newer models are more expensive but why is there a big difference between the 2 if there basically the same specs? And which one should I buy? I just dont want the 2012 15" to have horrible battery life either