 During Expedition 61 Meir was scheduled to perform three spacewalks during this mission to help install new lithium-ion batteries on the Port-6 truss structure of the ISS, although this schedule was later changed.On October 18, 2019, Meir performed her first spacewalk alongside her colleague Christina Koch, replacing a faulty Battery Charging Discharging Unit.The unit had unexpectedly failed to activate, preventing the station's newly installed lithium-ion batteries from providing additional power.