NASA astronaut Robert Behnken works during the Wednesday, July 1, 2020, six-hour and one-minute spacewalk to swap an aging nickel-hydrogen battery for a new lithium-ion battery on the International Space Station's Starboard-6 truss structure. via NASA http://www.nasa.gov/image-feature/upgrading-the-space-station-is-all-in-a-days-work
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