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We investigate the steady-state charging process of a single-cell quantumbattery embedded in an N-cell star network of qubits, each interacting with afermion reservoir, collectively and individually in equilibrium andnon-equilibrium scenarios, respectively. We find an optimal steady-statecharging in both scenarios, which grows monotonically with the reservoirs'chemical potential and chemical potential difference. Where the high basetemperature of the reservoirs has a destructive role in all parameter regimes.We indicate that regardless of the strength of the non-equilibrium condition,the high base chemical potential of the battery's corresponding reservoir cansignificantly enhance the charging process. On the other hand, a weak couplingstrength can strongly suppress the charging. Consequently, our results couldcounteract the detrimental effects of self-discharging and provide valuableguidelines for enhancing the stable charging of open quantum batteries in theabsence of an external charging field.

Steady-state charging of quantum batteries via dissipative ancillas