USPS Homepage

USPS Packaging Instruction 9D

Lithium and Lithium-ion Cells and Batteries

Primary lithium (non-rechargeable) cells and batteries and secondary lithium-ion (rechargeable) cells and batteries are mailable in limited quantities domestically via air or surface transportation and internationally when properly packed with or properly installed in the equipment they operate. Primary lithium (non-rechargeable) cells and batteries are mailable in limited quantities domestically via surface transportation when the cells or batteries are not packed with or installed in equipment and are in the originally sealed packaging.