Learn more about the lenovo laptops > explore all home > laptops > thinkpad > thinkpad x > x1 carbon (4th gen) thinkpad x1 carbon:. With long battery life, a best-in-class keyboard, and a slim, soft-touch design, the thinkpad x1 carbon is the maserati of business laptops.. When lenovo launched the thinkpad x1 carbon in 2012, the uber-light 14-inch laptop took the business notebook world by storm with its svelte, 3-pound carbon-fiber. The thinkpad x1 carbon is an excellent business ultraportable, offering strong performance, long battery life and an improved keyboard, all in a svelte and durable. Our lightest and thinnest thinkpads featuring our all-star x1 carbon, x1 yoga and x260 laptops. power. performance. portability..