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[b]ISS Expedition 63: U.S. Spacewalk 67[/b] NASA astronauts Bob Behnken and Chris Cassidy began the first of two final spacewalks to finish a 3.5-year effort to upgrade the International Space Station's power system on Thursday (July 16). They are working to replace batteries on one of two power channels on the station's far starboard truss (S6 Truss). Behnken and Cassidy switched their spacesuits to battery power at 7:10 a.m. EDT (1110 GMT) to begin the spacewalk, which is expected to last between six and seven hours. The spacewalkers will be removing five existing nickel-hydrogen batteries and replacing them with three new lithium-ion batteries that arrived on a Japanese HTV cargo ship last month. The batteries store electricity for one pair of the station's solar arrays, and the swap will upgrade the station's power supply capability. The batteries store power generated by the station's solar arrays to provide power to the microgravity laboratory when the station is not in sunlight as it circles Earth during orbital night. This is the 230th spacewalk in support of space station assembly and maintenance. Behnken is extravehicular crew member 1 (EV 1), wearing the spacesuit with red stripes, and using helmet camera no. 20. Cassidy is extravehicular crew member 2 (EV 2), wearing the spacesuit with no stripes and helmet camera no. 18. It is the ninth spacewalk for both astronauts.
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