I have a 2014 11" MacBook Air, and a 2011 15" MacBook Pro with a dGPU. Both are getting horrible battery life with Sierra. I was running all the betas and did an upgrade to the retail version as a sanity check. I am currently on the 10.2 Developer beta to see if that helps at all (It didn't). I don't have any statistics on my 211 MacBook Pro, other than after about 2 hours I was down to 45% last week. On the MacBook Air, however I do have some numbers. Last Friday I played a game and it drained completely in an hour. I then charged it to full thinking it needed a calibration. Later that night, I did some casual web surfing and it died exactly 3 hours later Today I'm re-downloading El Cap over wifi and I've lost 12% battery in 30 minutes. A few questions: Is anyone else noticing bad battery life? Did anything fix it? Does a clean install work? It's not often I need to run my Mac on just battery, but I'm thinking of downgrading one of the Macs to El Cap to see if my battery life goes back to normal.