However, the solid oxide metal air battery analysis does not include the mass and volume of the system-level components such as heating elements, insulation, and fans. Further analysis is needed to examine if the system level specific and volumetric energy density are competitive with state-ofthe-art room temperature battery systems. As a final aside, from the cell level-analysis we can see that if a high density is desired, a large volume fraction of lithium oxide must be present in the molten salt solution. This high volume fraction will result in a significant volume change in the molten salt as the cell charges or discharges. This presents a challenge in terms of power density because the contact area between the molten salt and solid electrolytes will change significantly over the course of charging and discharging the cell.