US EVA-66

NASA astronauts Chris Cassidy and Bob Behnken will exit the orbital lab on July 1 to continue replacing batteries that store and distribute power collected from the solar arrays. They will work on the outer portion of the truss structure, or the Starboard-6 truss, disconnecting and removing the old nickel hydrogen batteries. Following that, new lithium-ion batteries will be installed in their place and powered up by mission controllers on the ground.