We start off 2008 with new rules for traveling safely with batteries. From Safetravel.dot.gov
- Spare batteries are the batteries you carry separately from the devices they power. When batteries are installed in a device, they are not considered spare batteries.
- You may not pack a spare lithium battery in your checked baggage
- You may bring spare lithium batteries with you in carry-on baggage – see our spare battery tips and how-to sections to find out how to pack spare batteries safely!
- Even though we recommend carrying your devices with you in carry-on baggage as well, if you must bring one in checked baggage, you may check it with the batteries installed.
There is a handy PDF you can download as well: Batteries_flyer.pdf