  The surface composition of charged Lennard-Jones clusters A$_N^{n+}$,
composed of N particles (55 \leq N \leq 1169) among which n are positively
charged with charge q, thus having a net total charge Q = nq, is investigated
by Monte Carlo with Parallel Tempering simulations. At finite temperature, the
surface sites of these charged clusters are found to be preferentially occupied
by charged particles carrying large charges, due to Coulombic repulsions, but
the full occupancy of surface sites is rarely achieved for clusters below the
stability limit defined in this work. Large clusters (N = 1169) follow the same
trends, with a smaller propensity for positive particles to occupy the cluster
surface at non-zero temperature. We show that these charged clusters rather
behave as electrical spherical conductors for the smaller sizes (N \leq 147)
but as spheres uniformly charged in their volume for the larger sizes (N =
1169).
