Quantum batteries (QBs) represent a promising and emerging class of energy storage devices that exploit the principles of quantum mechanics to achieve superior performance compared to conventional, classical batteries. In this work, we investigate the charging dynamics of a QB in a bipartite system composed of two qubits, where one qubit acts as a charger and the other as the battery, each embedded in an independent cavity reservoir. The model incorporates multiphoton atom-cavity interactions as well as quenched disorder (QD) in the system-reservoir coupling, including discrete, uniform, Gaussian, and Cauchy-Lorentz distributions. The resulting dynamics are analyzed in both weak- and strong-coupling regimes. We examine how the multiphoton order affects the internal energies of the charger and the battery, and show that increasing the multiphoton order leads to enhanced dissipation and a reduction of the energy transferred to the battery. By comparing different disorder statistics, we find that uniform and discrete QDs can partially mitigate decoherence and yield higher charging efficiency compared to Gaussian and Cauchy-Lorentz QDs. Furthermore, our results demonstrate that strong system-reservoir coupling induces non-Markovian dynamics accompanied by rapid energy loss and suppression of ergotropy and efficiency. In contrast, efficient charging and partial revival features are predominantly observed in the weak-coupling, Markovian regime, where coherent dynamics are preserved.

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• Batteries
• Quantum optics