The massive SD-9 was equipped with laser-reflective armor, ionization shielding, powerful servomotors, and advanced targeting sensors. In place of hands, the SD-9's forearms supported a heavy repeating blaster and an explosive plasma cannon. This droid was rumored to be more than a match for a hundred infantrymen. The SD-9 was also fitted with an ionization shield generator.
Following the clone Emperor's second death at the Battle of Pinnacle Base, the Balmorrans rebelled. The Emperor then sent his Executor, Sedriss QL, to crush the revolt, thus resulting in the Second Battle of Balmorra. During the battle, the SD-9s were outmatched by the more advanced SD-10s. The Balmorrans also unleashed their new X-1 Vipers. This was to counter-act Sedriss' Shadow Droids. This resulted in a draw between the two factions.