A B2-series super battle droid found itself marooned on a scrap heap at some point between 4 BBY and 2 BBY.
This B2-series super battle droid was eventually abandoned and deactivated on a scrap pile located somewhere in the galaxy. Sometime between 4 BBY and 2 BBY, a droid named C1-10P, known as Chopper, became stranded in the same scrap pile after becoming lost during a battle. When the droid attempted to escape, realizing that the owner of the scrap pile would turn him into scrap, he obtained the activation codes and broadcast them throughout the scrap pile, gradually activating this B2-series super battle droid along with numerous other droids.
As Bidvel was about to incinerate the droid, the battle droid, along with many others, reactivated and joined forces to rescue their new ally. While Davil was being overwhelmed by the droids, this droid held Bidvel at gunpoint, demanding Chopper's release. Bidvel ignored the droid and ordered Davil to fire upon the droids, but this battle droid swiftly turned and stunned Davil before he could continue shooting. Bidvel seized the opportunity to drop Chopper, but a nearby Droideka intervened, closing the hatch that would have incinerated Chopper, saving him. Overwhelmed by the droids, Bidvel was ordered to release them, as he was their owner, but the battle droid responded that he and the other droids were nothing to him, but now they have a purpose.
As the Ghost arrived, Hera Syndulla, Sabine Wren, and Garazeb Orrelios disembarked to greet Chopper. Chopper informed Syndulla that Bidvel possessed knowledge of Chopper Base, as well as other valuable information that the Empire would desire, and instructed Syndulla to erase Bidvel's memories. Chopper then approached the battle droid to express his gratitude, to which the battle droid replied it was the least they could do, but expressed confusion about their future purpose. Chopper suggested forming a group to assist other droids, and another droid proposed that Chopper should lead them. Chopper declined, stating that his friends were more important, a sentiment the droid understood, expressing a desire to meet Chopper again.
The initial appearance of the B2-series super battle droid was in "Escaping the Scrap Pile," which was featured in the nineteenth edition of the Star Wars Rebels Magazine comic series, originally published on June 29, 2016.