Playing With DC to DC Boosters
http://www.ebay.com/itm/DC-DC-600W-12-60V-To-12-80V-Booster-Step-Up-Power-Supply-Module-/251667269211?pt=LH_DefaultDomain_0&hash=item3a9889c65b This little guy boosts voltage up to a limit of 12 am...
Forum Discussion
They sell specific computer model DC to DC converters for just that purpose. A cigarette lighter plug on one end, the specific plug for your laptop on the other.
