Transportation classes shape the next step.
DOT uses nine hazard classes, with divisions where applicable. The class is a starting point: the material, quantity, packaging, condition and transport mode determine the requirements. Planned workflows would retain reviewed classifications; they would not independently certify a shipment.
Class 1
Explosives
Class 2
Gases
Class 3
Flammable liquids
Class 4
Flammable solids; spontaneously combustible and dangerous-when-wet materials
Class 5
Oxidizers and organic peroxides
Class 6
Poisonous and infectious substances
Class 7
Radioactive materials
Class 8
Corrosive materials
Class 9
Miscellaneous hazardous materials, including lithium-ion batteries
Lithium-ion batteries are generally Class 9. Class 2 covers gases: Division 2.1 flammable, 2.2 non-flammable and non-poisonous, and 2.3 poisonous. Product-specific classification and exceptions require review. DOT/PHMSA: classification definitions ↗