The hybrid supercapacitor combines the outstanding energy density characteristics of batteries with the remarkable durability and unique power characteristics of supercapacitors (SCs). Herein, a hydrothermal technique was applied to produce nickel-copper sulfide (NiCuS), which was later physically embedded into carbon nanotubes. In this study, a three and two electrode measurement systems were studied. To confirm the battery type nature of the electrode materials, a three-electrode assembly was used. For hybrid device, a two-electrode measurement scheme was employed. In the three-electrode setup, the NiCuS@CNT composite revealed a superior specific capacity (Qs) of 1110.0 C g⁻¹. The NiCuS@CNT//AC nanocomposite based hybrid device established a remarkable Qs of 620.9 C g⁻¹. Additionally, the NiCuS@CNT//AC exhibited a remarkable energy density (E_d) of 29.5 Wh kg⁻¹ and a power density (P_d) of 2165.0 W kg⁻¹.This composite material is distinguished for its remarkable capacity retention, maintaining an amazing 88.2% of its capacity after 8000 cycles. This emphasizes its continued stability and the possibility of having a longer operating lifespan. By advancing energy storage technologies, this dynamic integration might provide brand-new, exciting opportunities.