I got my i5 15 incher when they came out and like many people was disappointed by the battery life. It was decent though and I said hey, 6 hours is great! Recently though I've been getting 3 and my usage hasn't changed at all. I mostly use my computer for chrome (rarely flash), mail, and itunes. I called Apple and the guy I spoke with wasn't the most knowledgeable person but he suggested that I reset the System Management Controller. I did that and now it looks like I'm getting 5-6 hours again! Hooray lol. Anyway I had to register and tell you guys. I hope this helps people out.