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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 BB ! Xe and BB 0 ! Xe. These were performed on a sample of 231 10 6 B B events recorded with the BABAR detector at the 4S 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 B meson. We obtain BB ! Xe=BB 0 ! Xe 1:074 0:041 stat 0:026 syst .