 Once the handrail was removed, Massimino went to work attaching the capture plate, but ran into additional problems when the battery in one of his power tools failed.Massimino was instructed to return to the orbiter's airlock to retrieve a spare tool and to recharge his suit's oxygen reserves, to allow for completion of the STIS repair.The rest of the STIS repair work was completed without any problems, but the spacewalkers were nearly two hours behind the scheduled timeline, so managers on the ground decided to postpone the task of installing a New Outer Blanket Layers (NOBLs) onto the telescope's outer shell.