Notebook PC Battery life

A lot of new "affordable" notebook PC's are popping-up in the market today, though the specs of these computers are comparable with most high-end ones, most have one drawback in my opinion, the battery life. Most of them has only 2 hours operating time. What do you think you could do in 2 hours time? Just when you're getting to enjoy your work then poof, there goes the low battery alarm. It's unfortunate that a lot of establishments are becoming hotspots, meaning the use of a mobile computer has more meaning in these times.