Taigei-class Submarine

The Taigei class is Japan's newest submarine design, succeeding the Soryu class. It replaces the Stirling AIP system with large-capacity lithium-ion batteries, enabling better power density and endurance while eliminating the complexity of AIP machinery. Features advanced sensors and quieting measures.

Lead boat JS Taigei commissioned 2022 — first Japanese submarine with Li-ion batteries. Seven planned. Represents Japan's continued investment in high-quality conventional submarine capability as a key asymmetric deterrent against China and North Korea.