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The assimilation of a quantum (finite size) particle by aReissner-Nordstr\"om black hole inevitably involves an increase in theblack-hole surface area. It is shown that this increase can be minimized if oneconsiders the capture of the lightest charged particle in nature. Theunavoidable area increase is attributed to two physical reasons: the Heisenbergquantum uncertainty principle and a Schwinger-type charge emission (vacuumpolarization). The fundamental lower bound on the area increase is $4 \hbar$,which is smaller than the value given by Bekenstein for neutral particles.Thus, this process is a better approximation to a reversible process inblack-hole physics. The universality of the minimal area increase is a furtherevidence in favor of a uniformly spaced area spectrum for spherical quantumblack holes. Moreover, this universal value is in excellent agreement with thearea spacing predicted by Mukhanov and Bekenstein and independently by Hod.Comment: 10 page

Best approximation to a reversible process in black-hole physics and the area spectrum of spherical black holes