Star Wars: Ashes of the Old Republic
B1 Battle Droid
B1 battle droids were battle droids that made up the backbone of the Trade Federation Droid Army and the Separatist Droid Army. Often called “Clankers” by Galactic Republic clone troopers, they were the successor of both the HKB-3 hunter-killer droid.[source?] and the OOM-series battle droid.
B1s were perhaps the most numerous—and expendable—soldiers in galactic history, and, unlike most organic soldiers, they were capable of action in hostile environments such as underwater or in space. They were designed, for the most part, to defeat their enemies through sheer numbers, not through their ability to think (they were very vulnerable to tricks) and utilize combat skills (unlike clone troopers).
The B1 battle droid was frequently used as a soldier for the Trade Federation. As a result, B1s were present in nearly every battle involving the Trade Federation.
Early battles involving the droids required a central computer for the droids to “think” from, but this was mostly removed post-Battle of Naboo after an attack destroyed the mainframe stationed there, resulting in all the droids on the planet being deactivated.