Ba2In2(1-x)Ti2xO5+x•1-x compounds (BITx) have been prepared by solid state reaction. Whereas Ba2In2O5 corresponds to an ordered Brownmillerite structure, for 0.15 < x < 1 all members adopt a disordered cubic perovskite structure at RT. This phase transformation induces a drastic increase of the anionic conductivity level. At 700{degree sign}C, 10-2 S.cm-1 is obtained for BIT07. Stable under hydrogen, the x = 0.7 was selected and a SOFC built on BIT07 and Ni/BIT07 cermet was tested. The peak power is about 500mW at 800{degree sign}C. Due to the basicity of these compounds, water uptake of BITx was investigated. The change of the lattice volume upon hydration, inferred from X-ray diffraction data, appears as an important parameter for the characterization of perovskite-type proton conductors. Proton conductivity higher than 1 mS.cm-1 was measured at 400{degree sign}C for BIT02. A ceramic fuel cell based on this material as electrolyte was evaluated.