By CBSDFW.com Staff

CAPE CANAVERAL, Fla. (CBSDFW/AP) — A four-year effort to modernize the International Space Station’s power grid is finally complete.

A pair of NASA astronauts installed the last battery component during a spacewalk Monday, and the unit checked out well. It’s the second spacewalk in five days for Mike Hopkins and Victor Glover.

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Glover, whose parents live in Prosper is the first African-American to move in for a long haul.

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Over the weekend, flight controllers in Houston used the station’s big robot arm to replace the last batch of old batteries with a new, more powerful one. Hopkins and Glover quickly put the finishing touches on this newest lithium-ion battery.

The International Space Station shown 261 miles above Columbia. (credit: NASA)

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Their work completes a series of spacewalks that began in 2017.

CBSDFW.com Staff