Junior executives on-the-go should take a few minutes to head over to the U.S. Department of Transportation’s Web site. It seems the DOT has implemented some new rules for 2008 as it relates to lithium batteries. Simply, you’re not allowed to put spare, unconnected batteries in your checked luggage anymore and you can only bring eight grams of lithium battery on-board with you. Eight grams is something like 100 watt-hours, so check your batteries before leaving for the airport. The last thing you’d want is to show up and be told that you’re over the battery limit. Not only would it be embarrassing, but it’d be such an inconvenience.