FYI - International Lithium Battery Postage

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Effective May 16, 2012, the Postal Service™ will revise Mailing Standards of the United States Postal Service, Domestic Mail Manual (DMM®) section 601.10.20 to codify that primary lithium metal or lithium alloy (nonrechargeable) cells and batteries or secondary lithium-ion cells and bat­teries (rechargeable) are prohibited when mailed interna­tionally or to and from an APO, FPO, or DPO location. However, this prohibition does not apply to lithium batter­ies authorized under DMM 601.10.20 when mailed within the United States or its territories.

http://about.usps.com/postal-bulletin/2 ... dt_004.htm