SoftBank to manufacture its own batteries to power AI data centers

SoftBank has announced plans to begin manufacturing battery cells and energy storage systems at its Sakai facility in Osaka, targeting gigawatt-scale production by the fiscal year ending March 2028. T... Read original →

SoftBank’s bet on zinc-halogen batteries isn’t just about storage—it’s a strategic hedge against the energy fragility of AI data centers. While offering lower energy density than lithium-ion, aqueous electrolytes drastically reduce thermal runaway risks, aligning with Japan’s stringent safety codes for high-density compute facilities. This move pressures upstream material suppliers to scale cost-effective zinc anodes and stable separators, while forcing co-design between 3nm AI accelerators and Cell-to-Pack architectures for holistic power efficiency. Yet vertical integration faces regulatory landmines: Japan’s Electricity Business Act restricts private power generation, and the absence of global standards for non-lithium storage complicates U.S./EU deployment. Competitors like Microsoft and Amazon have already secured solid-state capacity; Google may pivot to sodium-ion to avoid dependency. If SoftBank fails to demonstrate >5,000 cycles at GW-scale in Sakai within 18 months, its ‘GX+AX’ narrative risks becoming pure financial theater. Crucially, this signals that AI infrastructure rivalry has shifted from raw compute to full-stack energy resilience.