Flying with Li-Ion batteries

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The US Department of Transportation has announced new safety rules relating to the storage of rechargeable Lithium batteries when flying to, from, and within the USA. The new restrictions, effective from January 1st 2008, dictate that loose Lithium cells may not be packed in checked baggage; batteries installed in equipment are unaffected. Carry-on baggage may contain up to two loose batteries but only if there is no possibility of short-circuit, containing them individually within simple plastic bags or their original packaging is sufficient to prevent this and will satisfy inspectors.

http://safetravel.dot.gov/whats_new_batteries.html