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Effective May 16 2012 until January 2013, the Postal Service will not be able to accept packages containing lithium batteries and electronic devices containing lithium batteries addressed to international destinations. This includes mail destined to, or from, APO (Army Post Office), FPO (Fleet Post Office) and DPO (Diplomatic Post Office) locations.
This change is required by the standards of the International Civil Aviation Organization (ICAO) and the Universal Postal Union (UPU), both of which currently prohibit lithium batteries in mail shipments that are carried on international commercial air transportation.
This change will not apply to packages containing lithium batteries and electronic devices containing lithium batteries when mailed within the United States on domestic commercial air or ground transportation.