This simplifies it.
New Lithium Battery Rules for U.S. Airplanes
http://www.schneier.com/blog/archives/2007/12/new_lithium_bat_1.html
Starting in 2008, there are new rules for bringing lithium batteries on
airplanes:
The following quantity limits apply to both your spare and installed
batteries. The limits are expressed in grams of “equivalent lithium
content.” 8 grams of equivalent lithium content is approximately 100
watt-hours. 25 grams is approximately 300 watt-hours:
* Under the new rules, you can bring batteries with up to 8-gram
equivalent lithium content. All lithium ion batteries in cell phones are
below 8 gram equivalent lithium content. Nearly all laptop computers also
are below this quantity threshold.
* You can also bring up to two spare batteries with an aggregate
equivalent lithium content of up to 25 grams, in addition to any batteries
that fall below the 8-gram threshold. Examples of two types of lithium ion
batteries with equivalent lithium content over 8 grams but below 25 are
shown below.
* For a lithium metal battery, whether installed in a device or
carried as a spare, the limit on lithium content is 2 grams of lithium metal
per battery.
* Almost all consumer-type lithium metal batteries are below 2 grams
of lithium metal. But if you are unsure, contact the manufacturer!
Near as I can tell, this affects pretty much no one except audio/visual
professionals. And the TSA isn’t saying whether this is a safety issue or a
security issue.
Thank you very much Bobibutu.
That does simplify it.