I don't know much about general relativity, but I've seen many times that Black Holes can be described exactly by 3 properties: charge, angular momentum and mass. I've also recurrently seen that Black Holes can evaporate through Hawking Radiation, as this radiation takes away energy from the Black Hole.
Suppose a free space, where only the Black Hole exist. A spin-less charge-less Black Hole is the classical example of evaporation and it is able of evaporating completely. A charge-less Black Hole would emit photons in such a way to reduce its angular momentum and would also be able to vanish into nothing.
However, as photons are themselves charge-less, I presume the Black Hole's charge density could only increase until it reaches a maximum charge density allowed (if there is any). In a non free space the black hole would attract opposing charges and repel alike charges, so this is probably not a practical problem.
To sum up, I'm interested if there is any way a charged black hole can evaporate completely, or if there is any other way any Black Hole can evaporate that not Hawking Radiation. Also if there is any maximum charge density for a black hole, or if a charged Black Hole (assuming no non-Hawking radiation) would form an infinitely dense charge.
