The "Decoupling from Foreign Adversarial Battery Dependence Act" establishes a prohibition, effective October 1, 2027, preventing the Department of Homeland Security (DHS) from using appropriated funds to procure batteries from specific foreign entities. This restriction primarily targets several named Chinese battery manufacturers , including Contemporary Amperex Technology Company, Limited (CATL) and BYD Company, Limited. The prohibition also extends to any entity identified under the Uyghur Forced Labor Prevention Act, designated as a Chinese military company, or listed on certain Commerce Department regulations, encompassing their subsidiaries or successors. A battery is considered "produced" by such an entity if that entity assembles the final product or provides a majority of its components. The Secretary of Homeland Security has the authority to grant waivers to this procurement ban under two distinct circumstances. A waiver may be issued if the Secretary determines the batteries pose no national security, data, or infrastructure risk and no comparable alternative is available at similar cost and quality. Alternatively, a waiver is permissible if the batteries are intended solely for research, evaluation, training, testing, or analysis . Following any waiver, the Secretary must notify Congress within 15 days and is also required to submit a report within 180 days detailing the anticipated impacts and costs of implementing these provisions across various DHS components.