Robonaut 2 was launched on STS-133 on February 24, 2011, and delivered to the ISS. On August 22, R2 was powered up for the first time while in low earth orbit. This was called a "power soak" which is a power system test only with no movement. On October 13, R2 moved for the first time while in space. The conditions aboard the space station provide a proving ground for robots to work shoulder to shoulder with people in microgravity. Once this has been demonstrated inside the station, software upgrades and lower bodies may be added, allowing R2 to move around the interior of the station and perform maintenance tasks, such as vacuuming or cleaning filters. A pair of legs were delivered to the ISS on SpX-3 in April 2014. The battery backpack was planned to be launched on a later flight in Summer/Fall 2014.