Starting May 16, 2012 the USPS is prohibiting the shipping of lithium batteries when mailed internationally or to and from an APO, FPO, or DPO location.
The ban covers any devices that use a lithium or lithium ion battery; rechargeable or not. This means that companies cannot ship mobile phones, tablets (including iPads) , laptop computers, other items with these types of batteries using the United States Postal Service to locations outside the United States. Even if the batteries are not physically inside a device but in the same package, it is prohibited.
Graphic above from FastCompany.com
Shippers that need to send these type of items outside of the U.S.A. should look towards FedEx and UPS.
Remember: If you are insuring with Shipsurance your packages are not covered if they do not follow the carrier rules and regulations.
View the complete bulletin here: http://about.usps.com/postal-bulletin/2012/pb22336/html/updt_004.htm