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Dell's 14in. Latitude 6430u is no ordinary ultrabook. For a start, this 1.7kg third-generation Core (i3/5/7) system is built to MIL-STD 810G levels of ruggedness — the first ultrabook with this distinction, to our knowledge. Also, the battery is replaceable rather than being sealed in as is the case with most ultrabooks (and, of course, Apple's MacBook Air). With the 6-cell battery, Dell claims 10 hours of mains-free life for the Latitude 6430u.