I'm getting great battery life out of my Haswell Air, but I have found the remaining-battery-time readings to be way off. Sometimes at 70% is says 4 hours remaining. I fixed the issue a month ago, but it's gone bad again. Apple should include in OS X an automatated way for the system to keep an eye on that reading and have the system perform self-maintenance to retifty large descrpencies like this.
10/7/13 at 12:24pm