The interim final rule (IFR) issued by USDOT/PHMSA revises the Hazardous Materials Regulations (HMR) for lithium cells and batteries transported by aircraft. In this revision the USDOT/PHMSA harmonizes its HMR with the international regulations. 

What are the key changes? The new ruling:

  • Prohibits the transport of lithium ion cells and batteries when packed alone as cargo on passenger aircraft.
  • Requires lithium ion cells and batteries to be shipped at not more than a 30% state of charge aboard cargo-only aircraft if not packed with or in the equipment it is meant to power (i.e. packed alone).
  • Limits the use of the “small lithium cell or battery exception” for transport by aircraft at 49 CFR 173.185(c)(4) to one package per overpack or consignment.
  • Allows for a limited exception from the above restrictions on air transportation for lithium cells or batteries in medical devices.


  • Scope and applicability
  • Passenger aircraft prohibition
  • State of charge requirement
  • Consignment and overpack restriction
  • Limited exceptions to restrictions on air transportation of medical device cells or batteries

Important note: Though mostly applicable to the transport of lithium batteries by air, this rule change also affects the transport lithium batteries by highway, rail, and vessel. Contact me for further information .