NASA Astronauts Take Another Spacewalk to Change Batteries

The said spacewalk is part of a series of power upgrades that have been done in the ISS since January 2017. During the upgrades, nickel-hydrogen batteries are replaced with lithium-ion. Astronauts Robert Behnken and Chris Cassidy began their spacewalk at around 7:13 in the morning (ET) on Wednesday and ended after six hours and one minute at 1:14 PM ET.