The lithium-ion battery pack, independently developed by the Changchun Institute of Applied Chemistry at the Chinese Academy of Sciences, has triumphantly concluded a rigorous 4,200-meter-deep test in the South China Sea. Boasting an impressive energy density of 400Wh/kg, this technology heralds a new era of lightweight, highly reliable, and long-lasting energy systems for deep-sea applications. China has thus become the first nation globally to integrate such high-specific-energy lithium-ion battery technology into deep-sea equipment, ushering in a transformative energy solution for marine exploration.