Battle droid 513, a hodgepodge creation, served as a target for the Mandalorian Death Watch. This specific droid was constructed using parts salvaged from a Retail Caucus LR-57 combat droid, a typical battle droid, and a LM-432 crab droid, and possessed a sophisticated Vocabulator.
During the arrival of Jedi Padawan Ahsoka Tano, Lux Bonteri, and R2-D2 on Carlac, he was present. Due to his lack of speed in evading blaster fire, the Death Watch inflicted damage upon him. When R2-D2 was tasked with repairing them, battle droid 513 and the other droids pleaded with him to put them back together. While the Death Watch went to the Ming Po town and engaged Tano, R2-D2 completed the repairs on the droids. Witnessing Tano's capture by the Death Watch, R2-D2 requested assistance from the droids, including battle droid 513, to help rescue her. R2-D2 successfully diverted the Death Watch's attention and provided Tano with her lightsabers. As she dueled Pre Vizsla, the leader of Death Watch, the battle, along with the combatants, moved outside. There, alongside Bonteri, R2-D2, and the other droids, battle droid 513 fought the warriors. Ultimately, he was struck by a Death Watch warrior's shot and collapsed.