Given that the goal of this architecture is to enable a high energy density, and high specific energy system, a simple cell-level energy density estimate was performed. The detailed parameters of this calculation are included in Figures and. If the specific energy goal at the cell level is 1000 Wh/kg at the cell level, then there are a possible set of parameters to achieve this goal. Based on optimistic thicknesses of solid electrolyte materials and lithium oxide discharge products, we see that a significant amount of extra mass is available as margin to achieve this specific energy goal. We also calculate the volume breakdown of the system, with a system level goal of 1500 Wh/L, shown in Figure . We note that the volumetric energy density is calculated in the charged state, when the system level volume is significantly larger than the discharged state. For comparison, the current state-of-the-art (as of 2021) cell level energy density and specific energy of lithium-ion batteries are about 730 Wh/L and 265 Wh/kg respectively.