Extravehicular mobility unit

Over the years, many of Yardney s battery systems became an integral part of the nation s most advanced spacecraft systems. Some of these products enabled significant technical milestones such as primary power for the astronauts life support system (Extravehicular Mobility Unit or EMU) that used Yardney s 25 Ah silver zinc battery. 

EEI design engineers undertook rigorous design analyses to obtain preliminary design calculations for a bipolar Ag-MH battery to replace a silver-zinc (Ag-Zn) battery with 0.5 kWh capacity, which qualified for an extravehicular mobility unit (EMU) in a manned space flight application. In or about 1992, low-capacity Ag-Zn batteries were deployed in space applications. Typical EMU battery performance requirements can be summarized as follows ... 

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