Now if you are talking about the silly USPS ban on li-ion batteries:
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 bat.teries (rechargeable) are prohibited when mailed interna.tionally or to and from an APO, FPO, or DPO location. However, this prohibition does not apply to lithium batter.ies authorized under DMM 601.10.20 when mailed within the United States or its territories.
International standards have recently been the subject of discussion by the International Civil Aviation Organiza.tion (ICAO) and the Universal Postal Union (UPU), and the Postal Service anticipates that on January 1, 2013, cus.tomers will be able to mail specific quantities of lithium bat.teries internationally (including to and from an APO, FPO, or DPO location) when the batteries are properly installed in the personal electronic devices they are intended to operate.