November 15, 2012 the US Postal Service (USPS) will begin accepting packages containing “small” lithium batteries installed in electronic devices for international air transport, including to Army (APO), Fleet (FPO) and Diplomatic Post Office (DPO) locations. (“Small” lithium batteries include the following: lithium metal cells containing no more than 1 g lithium metal; lithium metal batteries containing no more than 2 g lithium metal; lithium ion cells with a Watt-hour rating not exceeding 20 Wh; and lithium ion batteries with a Watt-hour rating not exceeding 100 Wh.)

Please note USPS may only accept for international air transport electronic devices containing small lithium batteries. The USPS is not authorized to accept lithium batteries or lithium batteries packed with equipment for international air transport. No changes were made to domestic mailing of lithium batteries. The USPS will accept small lithium batteries, batteries in equipment and batteries packed with equipment for US domestic mailing. For more information please see the USPS’s announcement in the PDF below.
View Lithium Battery Special Edition November 2012.pdf