Most studies of quantum batteries have been restricted to conventional atoms whose size is much smaller than the electromagnetic modes. Here we propose a scheme for a quantum battery based on giant atoms in a coupled-resonator waveguide. Specifically, both the charger and the battery are giant atoms coupled to the waveguide in a braided configuration at multiple spatially separated points, enabling nonlocal and non-Markovian interactions mediated by propagating photons. We show that the charging process is governed by the formation of bound states in the continuum, which arise from constructive interference between spatially separated coupling channels. The stored energy exhibits long-lived Rabi oscillations associated with the suppression of decay into the waveguide continuum. The ergotropy and energy extraction efficiency can be significantly enhanced by tuning the atom-field interaction and the distance between the coupling points. Our work highlights the potential of giant atoms for high-performance quantum batteries, revealing that the spatially distributed coupling provides a promising route toward enhancing both charging efficiency and energy storage stability.

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• Open quantum systems & decoherence
• Quantum description of light-matter interaction
• Quantum foundations
• Waveguides