[mapleoin]

I have an X220, too, but it only has ~3 hrs battery life. Where did you buy yours?

[jrockway]

I have two, one for work and one I bought myself from Lenovo. They both get about 8 hours battery life with the 9-cell battery.

[bo1024]

Mine too, but it runs very hot and gets significantly less battery on Linux than Windows. (How you know something's wrong.)

I tried a fix or two as suggested, but they didn't help; I hope the kernel upgrade does it!

[jrockway]

I don't know how mine compares to Windows, but it doesn't run particularly hot. I don't use anything fancy on my Linux boxes; xmonad and some terminals on my home machine, xmonad and GNOME on my work machine. Very low-CPU :)

[replax]

Same for me, I have an x220 using the 6cell and get around 3h on Windows and about the same on ArchLinux... Broken battery?