  Quantum batteries are miniature energy storage devices and play a very
important role in quantum thermodynamics. In recent years, quantum batteries
have been extensively studied, but limited in theoretical level. Here we report
the experimental realization of a quantum battery based on superconducting
qubits. Our model explores dark and bright states to achieve stable and
powerful charging processes, respectively. Our scheme makes use of the quantum
adiabatic brachistochrone, which allows us to speed up the {battery ergotropy
injection. Due to the inherent interaction of the system with its surrounding,
the battery exhibits a self-discharge, which is shown to be described by a
supercapacitor-like self-discharging mechanism. Our results paves the way for
proposals of new superconducting circuits able to store extractable work for
further usage.
