NASA astronauts Christina Koch and Dr. Jessica Meir exited the International Space Station to begin an Extravehicular Activity – EVA, or spacewalk – on Friday that largely saw the duo replace a failed Battery Charge/Discharge Unit on the Station’s P6 truss structure.Â
The unit failed to reactivate after the first two of a five spacewalk sequence to replace 12 old batteries with six new and improved Lithium-ion batteries. The replacement work was successful.