On Tuesday, Dell revamped its Latitude desktop line, adding a number of new models for small businesses.

Included in the presentation was this line, according to Cisco Cheng, PC Magazine's laptop analyst, who covered the story: "All-day battery life that works as hard as you do--the E6400 can get up to 19 hours* with a 9-cell battery and optional battery slice."

And that's true, although Cisco rightly points out that "You'll need both the 9-cell and a 12-cell battery slice to achieve this, and battery life varies depending on usage, the operating system, and system settings."

Oh, and $99 for the upgrade to the 9-cell battery as well as $399 for the battery slice, to boot. So for a total of almost $500, you can work an entire San Francisco-to-Taipei flight, rather than sleep.