The HP Elitebook 6930p coupled with an optional extended life battery and a handful of other caveats has managed 24 hours of battery runtime. Said caveats include the purchase of said Ultra Capacity battery, Intel 80GB SSD, HP Illumi-Lite LED display and Windows XP. HP's LED displays are said to boost battery life by up to four hours and the Intel SSD claims up to a seven percent increase in juice. The lowest configuration of the HP Elitebook 6930p notebook starts at 4.7 grams and has a 14.1-inch widescreen display. The notebook has also been designed to withstand extreme temperatures, vibration, and humidity. No word on pricing.  Despite the need to spend an extra penny or two to get 24 hours out of one battery, I'd bet we'd all be willing to pony up for that type of freedom, right?