NASA astronaut Christina Koch works while tethered near the Port 6 truss segment of the International Space Station to replace older hydrogen-nickel batteries with newer, more powerful lithium-ion batteries, during the October 11, 2019, spacewalk.

- Image ID: 2A6M5NY
NASA astronaut Christina Koch works while tethered near the Port 6 truss segment of the International Space Station to replace older hydrogen-nickel batteries with newer, more powerful lithium-ion batteries, during the October 11, 2019, spacewalk. Stock Photo
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NASA astronaut Christina Koch works while tethered near the Port 6 truss segment of the International Space Station to replace older hydrogen-nickel batteries with newer, more powerful lithium-ion batteries, during the October 11, 2019, spacewalk.
NASA Archive / Alamy Stock Photo
Image ID: 2A6M5NY
NASA astronaut Christina Koch worked while tethered near the Port 6 truss segment of the International Space Station to replace older hydrogen-nickel batteries with newer, more powerful lithium-ion batteries, during the October 11, 2019, spacewalk. Fellow NASA astronaut Andrew Morgan (out of frame) assisted Koch during the six-hour and 45-minute spacewalk. On Friday, October 18, 2019, Koch and fellow astronaut Jessica Meir will conduct the first all female spacewalk. They will replace a faulty battery charge/discharge unit (BCDU). The BCDU failed to activate following the installation of new lithium-ion batteries on the space station’s truss earlier this month.