Imagine pulling a laptop out of its box for the first time, only to worry that it may not include a battery due to its insanely light weight. That was my first thought when I retrieved the latest Lenovo X1 Carbon (5th generation) from its box. It's hard to imagine that this laptop is powered by anything other than thin air, mostly because it's hard to imagine there's an entire set of hardware -- including a battery, of course -- inside this thin and light body. What kind of sacrifices had to be made to produce such a svelte laptop? Surprisingly few, it turns out.