  We study a light-like charged collapsing shell in AdS-Reissner-Nordstrom
spacetime, investigating whether the corresponding Vaidya metric is supported
by matter that satisfies the null energy condition. We find that, if the
absolute value of the charge decreases during the collapse, energy conditions
are fulfilled everywhere in spacetime. On the other hand, if the absolute value
of the charge increases, the metric does not satisfy energy conditions in the
IR region. Therefore, from the gauge/gravity perspective, this last case is
only useful to study the thermalization of the UV degrees of freedom. For all
these geometries, we probe the thermalization process with two point
correlators of charged operators, finding that the thermalization time grows
with the charge of the operator, as well as with the dimension of space.
