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NASA astronauts  Jessica Meir and Christina Koch are set to conduct the first all-female spacewalk on Friday, Oct. 18.

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They will be replacing a faulty battery charge/discharge unit that failed to activate after a spacewalk Oct. 11.

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The faulty unit is preventing a set of recently installed batteries from providing increased power.

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It must be replaced before continuing a series of spacewalks to install new batteries.

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Women first performed spacewalks 35 years ago:

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First, Russian cosmonaut Svetlana Savitskaya in July of 1984.

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Then NASA astronaut Kathryn Sullivan in October 1984.

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Since then, a dozen U.S. women have completed 40 different spacewalks.

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This will be the fourth spacewalk for Christina Koch