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An all-female crew is performing the first of two spacewalks scheduled for January.

The mission for Expedition Flight Engineers Christina Koch and Jessica Meir is to replace batteries on the International Space Station, according to NASA.

They are swapping out nickel-hydrogen batteries with new lithium-ion batteries on the ISS solar array.

The batteries are the latest piece of the ISS power system upgrades that started in January 2017.

You can watch the live stream of the spacewalk below: