Battle droid 513

Battle droid 513 was one of many monster battle droids assembled by the Mandalorians of Death Watch for target practice during their stay on the planet Carlac in the midst of the Clone Wars. Death Watch cobbled their training droids together from droid parts of various models, including many originating from the Confederacy of Independent Systems' Droid Army. Battle droid 513 specifically was composed of the body of an LR-57 combat/retail droid, the right arm of a B1-series battle droid and a leg from a LM-432 crab droid.

Death Watch would continually reuse 513 alongside numerous other droids for target practice until the arrival of Jedi Padawan, Ahsoka Tano and her R2-series astromech droid, R2-D2, the latter of which would convince 513 and its fellow droids to rebel against their masters, resulting in a firefight during which 513 was destroyed by Bo-Katan Kryze while its compatriots fled off planet.

Text and facts from the “Battle droid 513” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.