HP is once again tweaking its Spectre x360 convertible laptops, but this time the changes promise to be more tangible. The new Spectre x360 13 and 15 boast common functional upgrades, such as a dual-chamfered design (it's now easier to lift the lid) and a privacy kill switch that electrically disables the webcam. However, the star of the show is undoubtedly the 13-inch model. It now boasts a whopping 22.5-hour peak battery life -- while it's likely to fall short of that figure in the real world, the 37 percent improvement over the previous generation is still huge. There's optional "gigabit-class" LTE on the 13-inch system, too.