We present an in-depth study of the Dicke quantum battery introduced in Phys. Rev. Lett. 134, 130401 (2025), in particular, showing explicitly that the $N^2$ power charging advantage found in the extensive regime agrees with the quantum speed limits for open systems dynamics. We also study the coherent energy extraction by an external driving field, thus extending previous results of Monsel et al. [Phys. Rev. Lett. 124, 130601 (2020)] to an $N$-atom “charger.”

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• Collective effects in atomic physics
• Quantum optics
• Quantum thermodynamics
• Superradiance & subradiance