Earlier quoted context omitted.
Sounds about right, I have 6 cell in my x220 (with Win7) and I'd guess its life is around 2.5 hours with those settings. It's short enough that I don't feel comfortable using it on the go, keep x220 at home almost always plugged in to AC. The battery difference between it and the UX305 is huge.
Thanks, good to know I'm in the average then. I wonder if the newer Lenovo (x250 for example) have much better battery life (on Linux) than the x220.
Performance wise it's very nice. Screen is decent, too. My only complaint is the that the keyboard has a bunch of non-full size keys. End and Insert are on a single key. Someone should be shot for that.