The first commercially available example of immersion cooling, XING Mobility's IMMERSIO™️ Battery Pack System submerges battery cells directly in a non-conductive liquid coolant, achieving effective heat distribution to provide the most effective thermal control. The flame-retardant nature of this fluid acts as a safety feature, suppressing overheating or fire events before they propagate between cells, and reducing the risk of thermal runaway (the spread of fire from cell to cell). To illustrate the dramatic improvement in safety, XING Mobility shows IMMERSIO™️ undergoing a nail penetration test here, in which a steel nail is slowly inserted into a battery cell within a pack to deliberately activate a fault and initiate thermal runaway. A famously difficult test, the Immersion-Cooled pack sees the fluid immediately act to prevent overheating in the cell, in contrast to the unprotected control pack to the left which almost immediately goes into thermal runaway.