Charge-preserving Reissner-Nordstrom evaporation endpoint ($m|Q|\ge 1/(6\sqrt{3}\pi )⟹M\to |Q|,T\to 0$)

In the ideal thermal-cutoff model where charged particles of mass $m$ are emitted only for $T>m$, a sufficiently large initial mass keeps charge fixed throughout evaporation exactly when $m$ is at least the fixed-charge Reissner-Nordstrom temperature maximum. Neutral radiation then approaches an extremal charged remnant of area $4\pi Q^2$. This conclusion does not include nonthermal electric-field discharge, nor establish finite-time attainment.