Q-FFF Theory postulates, that all rigid string based black holes (Bhs), with variable sizes, from semi-stable Ball lightning up to stable Comets, Dual Herbig Haro black hole bow shocks and even dual Galaxy Anchor Bhs, are negative charged from the outside and positive charged from the inside.
Q-FFF = Quantum Function Follows Form at the stringy quantum scale.
The origin of different charged Bh zones, is counter intuitive
1: the Bh repulsion of all Fermions and
2: the continuous pair production out of the chiral oscillating Axion-Higgs particle based vacuum lattice at the BH horizon and
3: the preference for positrons in the chiral vacuum, to merge with photons, forming a positive charged quark plasma at the inside of the Bh horizon. (see poster below)
see: https://www.researchgate.net/publication/330412501_Equal_Sized_New_Physics_Black_Holes_Do_Not_Merge_but_Form_Herbig_Haro_Systems
Other dual / quadrupole black hole effects: