&gt; Why is Apple the only one that can build a 15&quot; retina laptop with 9-10 hours of battery life?<p>The XPS 15 has better than a Retina display:<p>- Reina: 2880-by-1800 resolution at 220 pixels per inch.<p>- 4K: 3840-by-2160 resolution at 282 pixels per inch (60% more pixels).<p>So you&#x27;re comparing apples and oranges (minor pun intended). It is unsurprising that a display which literally has more work to do will consume more battery in the process.