Korea's battery history management system under the amended Motor Vehicle Management Act, in force since 17 February 2025, requires the battery identification number assigned at the manufacturing stage to be registered in the vehicle registration record and tracked through operation and scrapping; the Used Battery Act promulgated in May 2026 (in force 27 May 2027) and the August 2026 agreement between the industry and climate-environment ministries on an integrated platform now extend it to later stages. Yet when assumed success rates are compounded across the six lifecycle interfaces, identification-number continuity is 91.0% while history continuity, including BMS operating data, falls to 81.9%. The larger variable lies in the reuse stage.…