Just a heads up--new TSA regs go into effect January 1 regarding carrying lithium batteries on board planes. The TSA annoucement is a bit confusing. The photo shows lithium ion batteries on the home page but the the text really seems to only be describing non-rechargeable "lithium" batteries like Energizer e2's. Very basically put, the rule is no loose "lithiums" in checked bags. In carry-on, on your person, or installed in a device inside your checked luggage, is OK.

Anyway, I'm still trying to clarify whether this rule applies to lithium ion batteries, too. In the meantime, just be mindful of those spare lithium batteries for your cameras, GPS, flashlights, etc. that you are thinking of just tossing in your checked luggage.