According to Einstein's E=mc^2 formula,shouldn't black holes be an unlimited source of energy?

The origin of this question comes from another question I searched: Does a charged battery weigh more than a used/discharged one? One of the answers I found was: " Yes a charged battery does weigh more than a discharged one, just as a spring under tension weighs more than when relaxed.Einsteins equations on mass and energy tell us that the mass of an object increases as its potential energy increases. However, for our purposes the increase or decrease is so small it is negligible and unmeasurable. In Einstein's equations for gravity on the left hand side we have the curvature of space time and on the right hand side the energy momentum tensor. So any kind of energy stored in a space-time region will contribute to the curvature of space-time. When you charge a battery you increase its energy content - somewhere else you lose energy, the charger and power supply in this case. So the battery will effectively bend space-time more than it has done before, so it will gain weight (increased mass)[...]". So in theory, what Einstein said is that there's this energy-mass relation, and with the increase of energy, we see an increase in the mass as well. But what if we're talking about a black hole, an object infinitely dense with infinite mass. Does that mean that a black hole has as well, infinite energy? If it actually does... How is that even possible?? Black holes are born from the collapse of a star, a star that can no longer produce energy in its core.... So how is this possible?? Is there even an explanation for this?

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"According to Einstein's E=mc^2 formula,shouldn't black holes be an unlimited source of energy?"No. Black holes have finite mass. So clearly they are not turning into infinite energy." what Einstein said is that there's this energy-mass relation, and with the increase of energy, we see an increase in the mass as well."No, he did NOT say that. Mass is not a function of motion. *Relativistic mass* may be, but that is NOT mass."But what if we're talking about a black hole, an object infinitely dense with infinite mass."Infinite density does imply infinite mass. And black holes do not have infinite density, since they have finite event horizons."Does that mean that a black hole has as well, infinite energy? If it actually does... How is that even possible?? Black holes are born from the collapse of a star, a star that can no longer produce energy in its core.... So how is this possible??"It doesn't, it isn't, you misunderstood.

Other Answers:

• Going based on my basic college knowledge upon the aspect ; It possesses the ability to create energy , but must have an action inflicted upon it to do so .
• Let's think of it this way, energy is released when a star collapses and this energy is released in a form of light, but since a black hole is formed, the light cannot escape it, thus the energy is trapped it there. Therefore, there will always be energy in a black hole, resulting in infinite energy!
• No. A black hole does not have infinite mass. It is that simple.
• It looks like you don't quite understand any of this..... you should post about your background when asking these kind of questions.