Abstract Title   The NASA EMU battery program and progress Abstract Author(s)   Craig Flora, Jeremy Neubauer, Jake Dembeck, Chris Pearson (ABSL) and Sam Russell, Eric Darcy (NASA JSC) Abstract Presenter   Craig Flora Abstract   In April 2008, ABSL was awarded the contract from NASA JSC for the Lithium-ion battery to power the Extravehicular Mobility Unit (EMU) that supplies essential functions such as life support to astronauts during spacewalks. This program was the first major contract to be conducted at ABSL’s Colorado facility and required a battery design capable of using two different 18650 Lithium-ion cells. Two batches of cells were procured for the program and, with the exception of cell processing of one of the cells and a single life test, all design, build and test work was performed in Longmont, Colorado. To date, twelve EMU batteries have been built (six of each cell type) and have been tested for performance, environmental exposures and for safety/abuse tolerance. The flight battery design has now been frozen, cell selection been made with the NL cell, and ABSL has begun building the 35 flight battery set and preparing for formal qualification.