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We study the interior of black holes in the presence of charged scalar hairof small amplitude $\epsilon$ on the event horizon and show their terminalboundary is a crushing Kasner-like singularity. These spacetimes arespherically symmetric, spatially homogeneous and they differ significantly fromthe hairy black holes with uncharged matter previously studied in [M. Van deMoortel, Violent nonlinear collapse inside charged hairy black holes,arXiv:2109.10932] in that the electric field is dynamical. We prove that thebackreaction of charged matter on the electric field induces the followingphenomena, that ultimately impact upon the formation of the spacelikesingularity:  - collapsed oscillations: oscillatory growth of the scalar hair, nonlinearlyinduced by the collapse.  - fluctuating collapse: the final Kasner exponents' dependency in $\epsilon$is via an expression of the form $|\sin(\omega_0 \cdot \epsilon^{-2}+ O(\log(\epsilon^{-1})))|$.  - Kasner inversion: a transition from an unstable Kasner metric to adifferent stable Kasner metric. The Kasner inversion occurring in our spacetimeis reminiscent of the celebrated BKL scenario in cosmology. We additionallypropose a construction indicating the relevance of the above phenomena -including Kasner inversions - to spacelike singularities inside more generalblack holes, beyond the hairy case. Our spacetime finally also corresponds tothe interior region of a holographic superconductor, which have been previouslystudied in the high-energy physics literature.

Kasner inversions and fluctuating collapse inside hairy black holes with charged matter