MBP battery issue is a bit complicated, especially when discrete graphics is present due to switching issues with their in-house solution (no Nvidia Optimus for

MBP battery issue is a bit complicated, especially when discrete graphics is present due to switching issues with their in-house solution (no Nvidia Optimus for OS X). MBAs on the hand, I've seen them go past 13 hours easily (~1 year old, WiFi off, low-med brightness, editing documents).