  In contrast to energy and angular momentum, electric charge is conserved in
mergers of charged black holes. This opens up the possibility for the remnant
to have Kerr-Newman parameter $\chi^{2} + \lambda^{2}$ greater than 1 (with
$\chi$ and $\lambda$ being the black hole dimensionless spin and dimensionless
charge, respectively), which is forbidden by the cosmic censorship conjecture.
In this paper, we investigate whether a naked singularity can form in
quasi-circular mergers of charged binary black holes. We extend a theoretical
model to estimate the final properties of the remnant left by quasicircular
mergers of binary black holes to the charged case. We validate the model with
numerical-relativity simulations, finding agreement at the percent level. We
then use our theoretical model to argue that while naked singularities cannot
form following quasi-circular mergers of non-spinning charged binary black
holes, it is possible to produce remnants that are arbitrarily close to the
extremal limit.
