What are the main lithium battery hazard classes used in IATA DGR?

• A. Nickel-cadmium batteries (UN 2795)
• B. Lead-acid batteries (UN 2794)
• C. Silver-oxide batteries (UN 3166)
• D. Lithium metal batteries (UN 3090 and 3091) and lithium ion batteries (UN 3480 and 3481)

Answer: (D)

The main lithium battery hazard classes used in IATA DGR are lithium metal batteries (UN 3090 and 3091) and lithium ion batteries (UN 3480 and 3481). These two categories are singled out because they cover the common lithium chemistries used in air transport and carry specific safety provisions due to the fire and thermal runaway risks associated with lithium-based cells. Lithium metal batteries are typically primary (non-rechargeable), while lithium ion batteries are rechargeable, and each type has its own UN numbers and packing and handling requirements. Other battery chemistries—such as nickel-cadmium, lead-acid, or silver-oxide—are not lithium battery hazard classes; they have different classifications and requirements.