In Reply to: No - the information is NOT correct posted by Ken Kurtis on December 31, 2007 at 13:58:24:

The TSA rule takes effect tomorrow and suggesting in a public forum (especially when stated so affirmatively) based on an anecdotal conversation with one TSA guy that the rule won't be enforced is irresponsible.

If you value your lithium batteries just bring them as carry-on items. Note the distinction between lithium metal batteries and lithium-ion batteries. For lithium-ion batteries you can calculate the maximum watt-hour capacity and if it's less than 100 watt-hours you can pretty safely assume the lithium content is less than 2 grams. For lithium-metal batteries beyond consumer grade, I'd be checking some websites tonight to determine lithium content if you're flying tomorrow. Of course the TSA can elect to ignore its own rules. But since when has the TSA been about that?