PHMSA issues this interim final rule (IFR) to revise the Hazardous Materials Regulations for lithium cells and batteries transported by aircraft. This IFR (1) prohibits the transport of lithium ion cells and batteries as cargo on passenger aircraft; (2) requires lithium ion cells and batteries to be shipped at not more than a 30 percent state of charge aboard cargo-only aircraft when not packed with or contained in equipment; and (3) limits the use of alternative provisions for small lithium cell or battery shipments to one package per consignment. This IFR does not restrict passengers or crew members from bringing personal items or electronic devices containing lithium cells or batteries aboard aircraft, or restrict cargo-only aircraft from transporting lithium ion cells or batteries at a state of charge exceeding 30 percent when packed with or contained in equipment or devices.

https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/docs/standards-rulemaking/hazmat/rulemakings/70526/lithium-battery-ifr-submitted-fr-022719.pdf

Whole thing is example of bureaucrat behaving like shits. Solving problem is simple - adding special packaging and making special cargo and parcels for them that will be packed in protective boxes.

Instead we have worldwide madness that is also sponsored by largest corporations as allow to restrict free trade of high profitable batteries.