Your 2022 Guide to Lithium Battery Labels - Barcode Blog Lithium metal battery instructions include: Amount of lithium in grams. Gross weight of batteries per package (in kg) Lithium Metal Batteries UN3090, P.I.968. Section 1A. Section 1B. Lithium Metal Cells. > 1 g lithium and ≤ 35 kg per package max. ≤ 1 g lithium and ≤ 2.5 kg per package max.