Since I frequently travel with more than 10 LI-ion batteries in devices and spares, I was ready to be outraged, but it appears that most consumer batteries (under 8 grams of lithium equivalent or 100 watt-hours) are not limited when in carry on luggage. For example a Macbook Pro battery is 60 watt hours. Li-ion batteries between 8 and 25 grams are limited to one in the device and two spares. Examples of these types of batteries as pictured on the DOT site are extended use camcorder and external laptop batteries. I know this might impact some professional videographers. I just wondered if anyone has heard anything more directly from reliable sources.
Traveling with lithium batteries There are several posts in the usual places about new regulations that control traveling with lithium metal and lithium-ion batteries. I think they spring from a poorly sourced AP story. Both the DOT and TSA sites do not seem really change what even the most tech laden traveler will have to plan for unless you check your batteries or carry some very heavy duty Li-ions. These rules are effective January 1, 2008, I will be interested what if anything happens to the traveling monkeys in the group.