Japanese astronaut Akihiko Hoshide and NASA astronaut Karen Nyberg operated the robotic arm for its final deployment maneuver. Then they placed the arm in a stowed position and finished up with checkouts of brakes within its joints.
The pair went on to open the hatch between Kibo and its logistics module so that it can be used as a storage area for the laboratory.
Commander Mark Kelly and Mission Specialist Mike Fossum swapped out battery charger modules inside the stationís Quest airlock.
Mission Specialist Garrett Reisman and Flight Engineer Greg Chamitoff continued handover briefings about living and working onboard the International Space Station. Reisman is returning to Earth aboard Discovery after three months in space. Chamitoff will remain onboard, serving as a NASA science officer, until the STS-126 shuttle mission targeted for launch in November.
Other crew members continued transferring equipment and supplies between the two spacecraft, with the hatches due to be closed Tuesday afternoon.
The crew is scheduled to go to sleep at 7:32 p.m. and awaken at 3:32 a.m. Tuesday.