Abstract: A construction which minimizes damage to alkaline electrolyte batteries due to electrolyte leakage caused by extreme variations in temperature is disclosed. The batteries comprise a multiplicity of individually sealed cells, arranged in electrically connected stacks, each stack being disposed in a moisture-proof plastic container and/or cup filled with an encapsulating resin in the entire space within the cup, with the encapsulated assembly being housed in a metal outer container. The cells within each stack and each stack itself is thus isolated, thereby minimizing any damage that might result from inter-cell leakage, from interstack leakage, and from leakage that would corrosively affect associated equipment in an assembled apparatus, due to extreme temperature variations, especially under high humidity conditions.