Mission Specialists Stephen Bowen and Michael Good began the second STS-132 spacewalk at 6:38 a.m. EDT.

Bowen adjusted a cable on the end of the orbiter boom. This brief task was added after discovering early in the flight that the cable was inhibiting a camera from maneuvering correctly. Bowen adjusted the cable and used a plastic tie to hold it in position.

The two spacewalkers are replacing three batteries on the station port solar array. Each of the batteries weighs more than 360 pounds and is requiring an intricate choreography between the spacewalkers to swap out safely. The spacewalk is expected to last six and a half hours.

Throughout the spacewalk, shuttle Commander Ken Ham will provide photo and television support, Pilot Tony Antonelli is serving as the intravehicular officer and Mission Specialists Garrett Reisman and Piers Sellers are again operating the station robotic arm.

Source http://www.nasa.gov/mission_pages/shuttle/main/index.html