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Oops you're right, thats me copying the RN metric incorrectly. Just replace every instance of [itex]Q^2[/itex] with |Q| in the post aboveNo, it won't, because ##M## is the mass of the entire spacetime, as seen at infinity. If energy is pumped into the shell, then ##M## at infinity already contains that energy. See further comments below.

That's ##Q^2##, not ##Q##. Check the dimensions of all the constants; you'll see that ##G / \epsilon_0 c^4## has dimensions of meters squared per Coulomb squared, so you have to take its square root to convert charge to length.