A polymer electrolyte battery with

The present invention is a battery with polymeric electrolyte (PEM) comprising at least one monopolar plate separating two electrolytic cells, wherein said monopolar plate has a through slot through which flows a reactive fluid, where said fluid reactant feeds while the two electrodes juxtaposed one on each side of the plate. Replacing the bipolar plates of the technique by monopolar plates with through channels operating as anode or cathode simultaneously in two adjacent electrolytic cells mounted in parallel, improving the operation of existing electrolytic cells lightening material and reducing its size.