  We analyse the charging process of quantum batteries with general harmonic
power. To describe the charge efficiency, we introduce the charge saturation
and the charging power, and divide the charging mode into the saturated
charging mode and the unsaturated charging mode. The relationships between the
time-dependent charge saturation and the parameters of general driving field
are discussed both analytically and numerically. And according to the Floquet
theorem, we give the expressions of time-dependent charge saturation with the
quasiengery and the Floquet states of the system. With both the analytical and
numerical results, we find the optimal parameters to reach the best charging
efficiency.
