LONG LIFE SEALED ALKALINE SECONDARY BATTERIES

In an aspect, provided is an alkaline rechargeable battery comprising: i) a battery container sealed against the release of gas up to at least a threshold gas pressure, ii) a volume of an aqueous alkaline electrolyte at least partially filling the container to au electrolyte level; iii) a positive electrode containing positive active material and at least partially submerged in the electrolyte, iv) an iron negative electrode at least partially submerged in the electrolyte, the iron negative electrode comprising iron active material; v) a separator at least partially submerged in the electrolyte provided between the positive electrode and the negative electrode; vi) an auxiliary oxygen gas recombination electrode electrically connected to the iron negative electrode by a first electronic component, ionically connected to the electrolyte by a first some pathway, and exposed to a gas headspace above the electrolyte level by a first gas pathway.