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Some people don't mind the short battery life. And battery tech is constantly improving; it'll get longer. It's possible it'll get to a point where most electronic devices work like many calculators--a small solar cell might be enough to power the batteries.
But for the next couple of years--tablets are going to be like early laptops: too bulky, too AC-dependent, too complex or limited in software functions to be really useful for anyone except technogeeks. Who will figure out how to exploit them shamelessly, and eventually the best of those uses will trickle down to the rest of us. And the batteries will last longer.
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