First task during this spacewalk was to prepare a worksite for new batteries that will be brought up on the STS-127 mission. They also installed a Global Positioning System antenna on the pressurized logistics module attached to the Kibo laboratory.

Moving one of the station's two Crew and Equipment and Translation Aid - or CETA - carts. The carts were moved to the port side of the station's truss during the previous mission to give the robotic arm's mobile transporter the best possible access to the starboard truss for the installation of the new truss segment and solar arrays. With that work done, one of the carts was moved back to the station's port side, leaving a cart for use on either side of the truss.