  We report measurements of the inclusive electron momentum spectra in decays
of charged and neutral B mesons, and of the ratio of semileptonic branching
fractions ${\cal B}\xspace(\B^+ \to X e \nu)$ and ${\cal B}\xspace(\B^0 \to X e
\nu)$. These were performed on a sample of 231 million $B\kern 0.18em\bar{\kern
-0.18em B}{}\xspace$ events recorded with the \mbox{\slshape
B\kern-0.1em{\smaller A}\kern-0.1em B\kern-0.1em{\smaller A\kern-0.2em R}}
detector at the $\Upsilon{(4S)}\xspace$ resonance. Events are selected by fully
reconstructing a hadronic decay of one $B$ meson and identifying an electron
among the decay products of the recoiling $\Bbar$ meson. We obtain ${\cal
B}\xspace(\Bu \to X e \nu)$/${\cal B}\xspace(\Bz \to X e \nu)$ = $1.084 \pm
0.041_{\mathrm{(stat)}}\xspace\pm 0.025_{\mathrm{(syst)}}\xspace$.
