During the 14th Five-Year Plan (2021–2025) period, China maintained its global lead in new energy vehicle production and sales for several consecutive years. In line with the circular economy, the recycling and reuse of retired EV batteries have seen major progress. By 2030, the number of retired batteries is expected to reach its peak, making efficient and eco-friendly processing of these "urban mines" a critical challenge. Our reporter Huang Yichang visited two leading companies to explore how they're transforming battery waste from a pollution risk into a valuable asset in China's green revolution.