Osmosis consumes and produces water

An acid-base battery produces its proton gradient by adding a base, such as potassium hydroxide, to one compartment, and an acid, such as hydrochloric acid, to the other. Since the proton gradient is what powers the acid-base battery, and not the mechanism used to generate it, it is reasonable to predict that other ways of generating a proton gradient should result in a similar acid-base battery, one that also consumes and produces water while releasing an electrical current