This paper proposes physical processes to use a Schwarzschild black hole as a rechargeable battery and nuclear reactor. As a rechargeable battery, it can at most transform 25% of input mass into available electric energy in a controllable and slow way. We study its internal resistance, efficiency of discharging, maximum output power, cycle life, and totally available energy. As a nuclear reactor, it realizes an effective nuclear reaction “$\alpha$ $\mathrm{particles}+\text{black hole}\to \mathrm{positrons}+\text{black hole}$” and can transform 25% mass of $\alpha$ particle into the kinetic energy of positrons. This process amplifies the available kinetic energy of natural decay hundreds of times. Since some tiny-sized primordial black holes are suspected to have an appreciable density in dark matter, the result of this paper implies that such black-hole-originated dark matter can be used as reactors to supply energy.

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• Classical black holes
• Quantum aspects of black holes
• Schwinger effect