For UN3090 Lithium Metal Battery shipments, what is the maximum weight allowed for an individual cell to be considered compliant at permitted dangerous goods locations?

• A. 2 g
• B. 1 g
• C. 0.5 g
• D. 5 g

Answer: (B)

Limiting lithium content per cell is essential because lithium metal can ignite or react violently if the energy inside a cell is too high. For UN3090 lithium metal battery shipments, at locations permitted to handle dangerous goods, the amount of lithium in each individual cell must not exceed one gram. This keeps the potential energy of a single cell small enough to manage safely during handling and transport. So, one gram is the maximum per cell for compliant shipments at those locations. Values larger than that would require more stringent restrictions or different classification and packaging.