Lead-free perovskite materials for capacitors have been recognized worldwide attention in recent times with high storage energy density and efficiency. A series of (Bi0.50Na0.40K0.10)(0.94)Ba0.06Ti(1-x)(Al0.50Ta0.50)(x)O-3 ceramics are synthesized using traditional mixed oxide route. All ceramics are in single-phase perovskite-like structure. At room temperature, high storage energy density, W-r similar to 1.67 J/cm(3), and conversion efficiency, eta similar to 81.46%, are perceived for x = 0.06 composition at 115 kV/cm. Temperature-dependent study obtains W-r similar to 1.21 J/cm(3) and eta similar to 84.96% at 80 degrees C with 80 kV/cm field. In addition, composition x = 0.06 is fatigue-free from 1 to 10(5) cycles measured at 80 kV/cm field. Furthermore, ceramic x = 0.04 is obtained a high bipolar strain similar to 0.31% at 80 kV/cm compared to other compositions. Hence, the compositions x = 0.06 for high energy density and x = 0.04 for strain might be useable in many electronic components.