Lithium Metal and Lithium–ion Cells and Batteries â€” Domestic. in limited quantities, via air transportation when both shipped from, and intended for delivery to, .
Learn more about USPS guidelines, restrictions, and tips for sending mail and packages within the United States and overseas.
Here is the exact DMM section relating to shipping lithium–ion batteries via USPS within. Here is a link to the USPS Domestic Mail Manual 601. You need to look at section 10.0 Hazardous Materials. You will probably need an ORM-D label.