https://cdnph.upi.com/ph/st/th/6181788175884/2026/i/17881761342584/v1.5/SK-On-signs-battery-deal-with-NeoVolta-Power.jpg" /> South Korea's SK On said Monday that the battery manufacturer has signed a multi-year contract with U.S. energy storage system, or ESS, corporation NeoVolta Power.