This work investigated the energy storage efficiency of two-dimensional copper doped barium titanate ceramics (Bax-1CuxTiO3). Both experimental and DFT approaches were used to investigate the charge storage characteristics of Bax-1CuxTiO3 in terms of parameters such as dielectric constant, piezoelectricity, recoverable energy storage (Wrec), energy storage efficiency and quantum capacitance. According to XRD, EDS and Rietveld refinement results, the presence of Cu impurities led to decrease in lattice constants with improved surface area, enhancing the recoverable energy storage and efficiency. From FT-IR data, shift in the vibrational peaks due to doping with Cu is an indication of changes in the electronic environment of BaTiO3, associated with quantum mechanical effects improves energy efficiency. Data from Wrec indicates highest recovery from 0.15 mol% Cu doped perovskite. However, 0.15 mol% doped system offered slightly lower efficiency than 0.10 mol% doped because imbalance between efficiency and energy density, attributed to higher Cu concentrations. Results from quantum capacitance also revealed significant improvement with Cu doping. Overall, both experimental and DFT data revealed some increase in piezoelectric values, with reduced ferroelectric features which enhanced the ability of Cu doped BaTiO3 retain more energy for future use.