  Devices that use quantum advantages for storing energy in the degree of
freedom of quantum systems have drawn attention due to their properties of
working as quantum batteries. However, one can identify a number of problems
that need to be adequately solved before a real manufacturing process of these
devices. In particular, it is important paying attention to the ability of
quantum batteries in storing energy when no consumption center is connected to
them. In this paper, by considering quantum batteries disconnected from
external charging fields and consumption center, we study the decoherence
effects that lead to charge leakage to the surrounding environment. We identify
this phenomena as a self-discharging of QBs, in analogy to the inherent decay
of the stored charge of conventional classical batteries in a open-circuit
configuration. The quantum advantage concerning the classical counterpart is
highlighted for single- and multi-cell quantum batteries.
