Hague and McClain will start their spacewalk at 8:05 a.m.
They also worked to remove debris from outside of the station. These new ISS batteries are preferred as they're more light-weight and more efficient than their nickel-hydrogen predecessors.
Friday's work is part of an ongoing effort to upgrade the space station's power system. This work will establish a redundant path of power to the Canadian-built robotic arm, known as Canadarm2. They will also install cables to provide for more expansive wireless communications coverage outside the orbital complex, as well as for enhanced hardwired computer network capability.
This was the 214th spacewalk to assemble and maintain the space station.
Friday's spacewalk is the first of three planned excursions to replace batteries and perform other maintenance.
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Spacewalkers have now spent a total of 55 days, 21 hours and 39 minutes working outside the station.
On March 22, two astronauts will take the first spacewalk of Expedition 59 in order to upgrade aging batteries on the International Space Station. Another six will be installed both today and during a spacewalk set for next week.
The live show can be watched on NASA Live.
"There were a lot of circumstances that got us here", said Kenny Todd, a senior space station manager at the Johnson Space Center in Houston. Hague is designated extravehicular crew member 2 (EV 2), wearing the suit with no stripes, and with helmet camera #17.
This is the first of two battery replacement spacewalks this month. The astronauts are swapping out old nickel hydrogen batteries with new lithium ion batteries and installing battery adapter plates.