So I want to get an ultrabook, 11.6 or 13.3" super slim asus or acer....but what I have noticed is that the batteries are always non removable, and in most cases irreplaceable. The whole reason for me to get an ultrabook was for how small and light and longer battery life, but every laptop I've had prior the batteries are replacable, and lose signficant battery time after about 1 year of usage. So if the battery life of an ultrabook is 5-7 hrs, I would assume after a year I would expect 1.5-2 hrs, which makes it worthless. Then I cant replace the battery so the whole ultrabook is worthless???

What am I missing????