The advent of quantum batteries (QBs) has coincided with the accelerated progress in quantum science and technology. Here, we propose a novel double-cavity QB design, wherein the maximum charging power can be enhanced to $N^{2.5}$ times or even higher, up to $N^3$ times, through the manipulation of atomic distribution, which surpasses the upper limit of $N^2$ reported in previous study. The advantage of this manipulation is pronounced with an increasing number of atoms in the QB. A significant atom number discrepancy between the two cavities results in the simultaneous optimization of charging power and battery capacity, thereby enhancing charging efficiency without compromising energy storage capacity. Additionally, by modulating the number of atoms within each cavity, the QB is theoretically capable of transitioning between “fast charging” and “slow charging” modes. Notably, in an open system environment, the superiority of the QB is even more pronounced, with negligible energy loss at the final steady state relative to the maximum energy storage of an isolated system.

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• Cavity quantum electrodynamics
• Quantum control
• Quantum engineering
• Quantum optics
• Quantum thermodynamics