I can recommend the lenovo x220 ultrabook. mine is lasting for 5-7 hours, but with additional battery packs, you can get it up to 24 hours apperently http://ww

I can recommend the lenovo x220 ultrabook. mine is lasting for 5-7 hours, but with additional battery packs, you can get it up to 24 hours apperently http://www.wired.com/gadgetlab/2011/03/lenovos-x220-thinkpad-with-24-hour-battery/ http://www.wired.com/gadgetlab/2011/03/lenovos-x220-thinkpad...