  Recently, an unconditional advantage has been demonstrated for the process of
charging of a quantum battery in a collisional model. Motivated by the question
of whether such an advantage could be observed experimentally, we consider a
model where the battery is modeled by a quantum harmonic oscillator or a large
spin, charged via repeated interactions with a stream of non-equilibrium qubit
units. For both setups, we show that a quantum protocol can significantly
outperform the most general adaptive classical schemes, leading to 90\% and
38\% higher charging power for the cavity and large spin batteries
respectively. Towards an experimental realization, we also characterise the
robustness of this quantum advantage to imperfections (noise and decoherence)
considering implementations with state-of-the-art micromasers and hybrid
superconducting devices.
