  In this article, in addition to the characterization of geometrical state
spaces for the passive states, an operational approach has been introduced to
distinguish them on their charging capabilities of a quantum battery. Unlike
the thermal states, the structural instability of passive states assures the
existence of a natural number $n$, for which $n+1$-copies of the state can
charge a quantum battery while $n$-copies cannot. This phenomenon can be
presented in a $n$-copy resource-theoretic approach, for which the free states
are unable to charge the battery in $n$-copies. Here we have exhibited the
single copy scenario explicitly. We also show that general ordering of the
passive states on the basis of their charging capabilities is not possible and
even the macroscopic entities (viz. energy and entropy) are unable to order
them precisely. Interestingly, for some of the passive states, the majorization
criterion gives sufficient order to the charging and discharging capabilities.
However, the charging capacity for the set of thermal states (for which
charging is possible), is directly proportional to their temperature.
