|Total EVA time:||21h 12m|
|No.||Date||Together with||Time||Main tasks and notes|
|1||14.03.2008||R. Linnehan||7h 01m||
Preparing the JEM ELM PS for its removal from the shuttle's payload bay. Later that day, the Japanese facility was installed on top of the Harmony module.
|2||17.05.2010||S. Bowen||7h 25m||
Installing a spare space-to-ground Ku-band antenna on the station's truss, or backbone. Then they installed a new tool platform on Dextre. The spacewalkers breaked the torque on bolts holding batteries in place on the truss, in preparation for their removal and replacement on the second and third spacewalks. Battery preparation work was deferred from STS-131 to this flight.
|3||21.05.2010||M. Good||6h 46m||
Installing the final two new batteries on the truss and put the old batteries on the carrier. Next, they retrieved a grapple fixture from Atlantis' payload bay and brought it inside the station for use as a spare.