Manufacturing methods with an in-depth understanding of the compaction process and electrochemical properties of solid electrolytes remain limited. At the same time, these are essential points for having higher solid-state battery performance. This study proposes solid electrolyte pellets made of LATP material and by conventional compaction and sintering, expectantly allowing easy adoption for laboratory research scale. The ready-made pellet was done under compaction pressure of 420 MPa and 80 MPa; then, it was measured under electrochemical impedance spectroscopy to obtain its ionic conductivity and tested under compressive loading to obtain its mechanical strength and compressive modulus. The quantified parameters of fabrication, electrical, and mechanical were also analyzed and compared with other related studies. With the same material composition, sintering parameters, and testing methods, the investigation generally found that the denser pellet, indicated by higher compaction pressure, significantly influenced the end electromechanical properties of LATP solid electrolyte for being higher with unchanged typical behavior. The findings received by the proposed manufacturing and testing methods in this study are then expected to support battery and electric vehicle technologies in further research development.