Japan's main submarine battery producer, GS Yuasa, does not advertise the secret Lithium-ion Batteries (LIBs) for its new class of Soryu submarines (the Soryu Mark 2s designated 27SS and 28SS). But a budding mole (probably already working for China) would find such LIBs in GS Yuasa's Large "Industrial and Military" (LIM) production division. Above is one of Japan's manned civilian submarines, the "SHINKAI 6500 Deep Submergence Research Vehicle" which, powered by GS Yuasa LIBs (driving a motor) can dive to 6,500 meters.
It is possible the Japanese Government (or companies) may share some LIBs technology with the US Government/Navy/companies under secret deals.
Please connect with Japan's Lithium-ion Battery Advantage..., October 15, 2015.
- The LIB safety experts - who did most of the research and most translation.