Hi, the gravitational field around a black hole is a form of negative energy. When a black hole evaporates it is converted into photons. These photons move away from the black hole. After it evaporated the gravitational field is gone so the negative energy is gone. But the total amount of energy stays the same because the total energy of all the photons is smaller than the mass of the black hole originally was. How much of the positive energy of a black hole disappears when it evaporates? Does it depend on it's mass? Could a black hole in theory be so massive that nearly all it's energy disappears? In other words, can it be so massive that the positive energy (it's mass) is identical to the negative energy of it's gravitational field?