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NASA Astronauts Attempt to Finish Repairing Aging ISS Batteries

VOA News

   NASA astronauts Chris Cassidy and Robert Behnken stepped outside the
   International Space Station (ISS) Thursday to continue efforts to
   complete a three-and-a-half-year project to upgrade the station's
   batteries, the space agency said.

   Cassidy and Behnken have been working to replace aging nickel-hydrogen
   batteries with new lithium-ion batteries delivered to the station on a
   Japanese cargo ship in May. In all, NASA said 12 spacewalks will have
   been performed since January 2017 to change out batteries for eight
   power channels used to route electricity on the station.

   Thursday's extravehicular activity is expected to last up to seven
   hours.

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