  The final (close to the singularity) dynamical behavior of the metric inside
black holes with massive charged scalar or vector hair is analyzed for general
anisotropic and inhomogeneous initial conditions. These solutions are relevant
to a holographic realization of superconductivity. It is shown that the
dynamics falls within the scope of the "cosmological billiard" description and
that in both cases, the corresponding hyperbolic billiard region has infinite
volume so that the system ultimately settles down to a final Kasner regime. For
massive vector hair, the conclusion holds because the longitudinal mode plays
the same role as a scalar field. There exists, however, a measure-zero subset
of solutions characterized by vanishing longitudinal modes that exhibit a
chaotic behavior with an infinite number of BKL oscillations as one goes to the
singularity.
