Measuring thickness-changes in a battery stack (dilation) during cyclisation is paramount for the characterisation of chemo-mechanical properties of battery materials. A variety of approaches to achieve these measurements is available, either for measuring the whole stack or individual active materials. Another topic of great interest is the cyclisation of batteries under an applied pressure. These pressures range from a few kPa to hundreds of MPa. Especially the research of solid-state battery materials requires measurements of electrochemical properties under pressure.In light of this, characterising chemo-mechanical properties under an applied pressure is a natural demand. However, to the best of our knowledge, no commercially available integrated solution to measure the dilation in a battery stack under any significant amount of applied pressure has been reported yet.We therefore present a convenient and reproducible method to derive thickness changes of a whole cell stack under defined pressures during cycling. For that, the commercially available PAT-Cell-Force was used (Image 1, left). The PAT-Cell-Force allows the application of a force of up to 1500 N on a cell stack of a diameter of 18 mm. This translates to a pressure of up to ~6 MPa. Additionally, the PAT-Cell-Force is equipped with a strain gauge sensor, allowing the measurement of the force during the experiment. While cycling, periodic fluctuations in the force signal are observed that are correlated to the cell voltage (Image 1, right).Through technical modifications of the PAT-Cell-Force, the dilation of the cell-stack Δd has been derived from the amplitude of the force signal ΔF, reproducibly and in very good agreement to the expected values. This has been achieved for applied forces of up to F0 ~ 100 N, corresponding to Pressures of approximately P0 ~ 400 kPa. Tests for higher pressures are currently pending. Figure 1