US astronauts completed the first of three planned space walks from the shuttle Atlantis after the craft docked with the International Space Station. <br/><br/>Astronauts Garrett Reisman and Stephen Bowen finished the seven-hour, 25-minute space walk after installing a second space-to-ground communications antenna and a spare parts platform on Dexter, the two-armed robotic device on the orbiting ISS. <br/><br/>NASA said it was the 237th space walk by US astronauts, the second for Reisman and the fourth for Bowen. <br/><br/>The pair meanwhile loosened battery bolts on the port-6 backbone segment of the station in preparation for the other space walks. <br/><br/>Atlantis brought to the station six new 170-kilogramme batteries to be installed during the second and third space walks. <br/><br/>The shuttle and its crew of six successfully docked with the orbiting space lab on Sunday about 350 kilometres above the South Pacific. <br/><br/>The 13-day mission is the 32nd and final scheduled voyage for Atlantis, which first launched in 1985 and has logged some 115 million miles in its career.