It’s not too bad once you wade through all the material. There are basically 3 categories, of lithium ion packages for DOMESTIC shipping. Inside equipment, packed with equipment, and without equipment. Lithium ion packed without equipment, it can’t be transported by air. It also seems like there are certain Wh, number of batteries, and weight restrictions too (see the link below, near the bottom of webpage)
Basically you just need to google either UN3481 or UN3480 (see below) to comply, print it out, and slap it on the box. It’ll have a photo of batteries and flame with UN3481/3480 clearly marked.
Anyone, feel free to correct me if I’m wrong.
https://pe.usps.com/text/pub52/pub52apxc_032.htm
*Lithium-ion batteries properly installed in the equipment they are intended to operate:
*Except for mailpieces containing button cell batteries installed in equipment (including circuit boards), or no more than 4 lithium metal cells or 2 lithium-ion batteries installed in the equipment they operate, mailpieces containing lithium-ion batteries must bear a DOT-approved lithium battery mark, as specified in 49 CFR 173.185©(i) and Exhibit 325.2a, applied to the address side of the mailpiece.
The mark must indicate UN3481 for lithium-ion cells or batteries installed in equipment.
The mark must also include a telephone number for those who need to obtain additional information.
*Lithium-ion batteries packed with the equipment they are intended to operate:
*Mailpieces must bear a DOT-approved lithium battery mark, as specified in 49 CFR 173.185©(i) and Exhibit 325.2a, applied to the address side of the mailpiece.
The mark must indicate UN3481 for lithium-ion cells or batteries packed with equipment.
Where a package contains lithium cells or batteries assigned to different UN numbers, all applicable UN numbers must be indicated.
The mark must also include a telephone number for those who need to obtain additional information.
*Lithium-ion batteries not packed with or installed in equipment (individual batteries):
*Mailpieces must bear a DOT-approved lithium battery mark, as specified in 49 CFR 173.185©(i) and Exhibit 325.2a, applied to the address side of the mailpiece.
The mark must indicate UN3480 for lithium-ion cells or batteries.
The mark must also include a telephone number for those who need to obtain additional information.
Mailpieces must also include the text “Surface Mail Only, Secondary Lithium Batteries — Forbidden for Transportation Aboard Passenger Aircraft” or “Surface Mail Only, Lithium-ion Batteries — Forbidden for Transportation Aboard Passenger Aircraft.”
