PCWorld - If Lenovo’s spendy ThinkPad X1 Carbon is the laptop every corporate drone craves, Lenovo’s thrifty ThinkPad X240 is the laptop their employer is more apt to spring for (assuming, of course, that the company’s IT department has standardized on Lenovo and not Dell, HP, Toshiba, or some other commercial laptop builder).
You might think the ThinkPad X240 is too thick and too heavy to qualify for Ultrabook designation, but it’s only 0.79 inches thick and it weighs just 3 pounds. And there’s a very good reason why the X240 doesn’t taper to a knife edge like the X1 Carbon does: The X240 is outfitted with two batteries and a battery bridge that enables you to swap a depleted battery for one that’s fully charged without turning the machine off. That’s slick.