NOVELTY - Fuel cell stack comprises two fuel cells, a manifold, and a desiccant in the manifold which is capable of absorbing water vapor present in the fuel cell stack to reduce the amount of water that sorbs to the solid polybenzimidazole electrolyte of the first fuel cell.    USE - As fuel cell stack.    ADVANTAGE - The desiccant prevents water condensation in high temperature proton exchange membrane fuel cells. The use of the desiccant and a water-sensitive solid electrolyte provides a fuel cell system which demonstrates a long useful life and good performance, and which is simple and inexpensive to make.    DETAILED DESCRIPTION - Fuel cell stack comprises a first fuel cell comprising a first flow field plate having an inlet and an outlet in fluid communication with the first flow field plate inlet, a second flow field plate having an inlet and an outlet in fluid communication with the second flow field plate outlet, and a solid polybenzimidazole electrolyte between the first and second flow field plates; a second fuel cell comprising a third flow field plate having an inlet in fluid communication with the first flow field plate inlet and an outlet in fluid communication with the first flow field plate outlet and the third flow field plate inlet, a fourth flow field plate having an inlet in fluid communication with the second flow field plate inlet and an outlet in fluid communication with the second flow field outlet and the fourth flow field plate inlet, and a second solid electrolyte between the third and fourth flow field plates; a first manifold (120, 130) in fluid communication with the first and third flow field plate inlets; and a desiccant (140) in the first manifold which is capable of absorbing water vapor present in the fuel cell stack to reduce the amount of water that sorbs to the solid polybenzimidazole electrolyte of the first fuel cell.    DESCRIPTION OF DRAWING(S) - The figure is a schematic diagram of a fuel cell stack having a desiccant.    Manifolds (120, 130)    Desiccant (140)