UN38.3 refers to Article 38.3 of Part 3 of the United Nations "Manual of Tests and Criteria for the Transport of Dangerous Goods," commonly abbreviated as UN38.3. To ensure the safety of air transportation and meet customer demands for shipping lithium-ion battery-containing goods, operational specifications for rechargeable lithium-ion batteries have been established in accordance with the relevant regulations of the International Air Transport Association's "Regulations for the Transport of Dangerous Goods." UN38.3 testing is specific to single-use or rechargeable lithium-ion batteries only.