Battery production constrained Japan's submarine force

Given their anti-submarine-warfare burden and asymmetric value, why did Japan not build more submarines?

The resources and industrial capacity needed to build submarine batteries were a major constraint.

The question starts from the asymmetric advantages submarines could bring to Japan's defensive strategy. Batteries were the limiting resource. Submarine numbers therefore depended on an industrial component that could not be expanded merely by changing doctrine. Force structure depended directly on the production capacity behind a specialized propulsion system.