The B2 super battle droid (SBD) was an upgraded version of the B1 battle droid, with superior armament and armor. They were manufactured after the battle of Naboo proved need for stronger droids. B2s were used by the Trade Federation, the Techno Union, and later, on a much larger scale, the Confederacy of Independent Systems. Some were also reactivated on Mustafar by X1 in the Battle of Mustafar. The Galactic Alliance also used some B2 units during the Yuuzhan Vong War.