In the first method, 5 mg of cathode composite, 200 mg of non-sintered electrolyte powders, and 20 mg of anode composite were co-pressed at 2 tons for 90 seconds using a uniaxial press. This type of cell was tested at 170 °C. In the second method, the pressure was increased to 4 tons, the pressing time was extended to 300 seconds and a sintered electrolyte layer of 200 mg was co-pressed in between 5 mg of cathode composite and 20 mg of anode composite. This second type of cell was tested at 140 °C. The difference in assembly procedures for cells tested at 170 °C and 140 °C was necessitated by the need to maintain similar electrolyte conductivity. At the lower temperature of 140 °C, sintering and a longer pressing duration were required to achieve conductivity comparable to that at 170 °C. The dimensions of the resulting pellet were approximately 1.3 mm in thickness and 7.3 mm in diameter. The pellets were spring-loaded into a modified air-tight Swagelok-type cell housing with the current collectors made of stainless steel. All the electrochemical cells were loaded, sealed and prepared for further handling inside the glovebox. The sealed cells were electrochemically tested outside the glovebox, the Swagelok-type cell housing was covered with glass wool to minimize temperature fluctuations. Battery testing was performed using a Biologic VSP300 potentiostat with the charging and discharging currents of +10 µA and -10 µA respectively, which translates to C/15 for charge and discharge with respect to the theoretical capacity of the active cathode material (~155 mAh g -1 for conversion to LaSrMnO4F2) and its mass within the cell. All the voltages are given as potential against the anode material. The mass of the active cathode material LaSrMnO4 within the cell was ~ 1.5 mg, whereas the anode composite was used in large excess compared to the active cathode material, which helps to have the electrochemical curves being mainly dominated by the active cathode material. The discharge process was carried out directly after the charging process. Different cut-off potentials were tested and compared. Cyclic voltammetry (CV) measurements were conducted in the potential range of ± 0.8 V for the active electrode with different scan rates of 0.05 mV/s, 0.08 mV/s, 0.1 mV/s, 0.12 mV/s at different temperatures (140 °C and 170 °C).