2 NASA astronauts take spacewalk at ISS

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This NASA TV frame grab shows astronauts Shane Kimbrough and Peggy Whitson on January 6, 2017 outside the International Space Station. (Photo by AFP)

Two NASA astronauts have ventured through a spacewalk at the International Space Station to upgrade the lab's power system.

The cosmonauts installed adapter plates and electrical connections for new lithium-ion batteries. The new batteries are expected to last until 2024.

The station has four sets of solar powered arrays, each equipped with 12 nickel-hydrogen batteries to provide electricity when the lab is in Earth's shadow.

The batteries are losing their ability to hold a charge and all 48 will be replaced over the next few years with smaller, more efficient lithium-ion batteries.


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