The B3 Ultra Battle Droid was a Combat Droid manufactured by Baktoid Combat Automata. It is based on the B2 Super Battle Droid model, but is far larger and boasts more substantial armor. It has two primary arms, with the right arm containing a tight-spray flamethrower and the left arm housing a wide-spray plasma cannon. Two secondary arms are located beneath the primary limbs and feature the same deadly rapid-fire blaster cannons found on a B2. There is a missile launcher built into the left shoulder capable of highly sophisticated target acquisition and tracking, with a density projector capable of increasing the droid's weight twenty-fold also installed.

• 1 Weapon slot of capacity 3, allowing items of type Weapon (Blunt), Weapon (Bladed), Weapon (Blasters), Weapon (Explosives), Weapon (Slugthrower), or Weapon (Miscellaneous)

• 1 slot allowing Aspects of type Droid Cosmetic
• 1 slot allowing Upgrades of type Droid Enhancement Upgrade - I, Droid Enhancement Upgrade - III, or Droid Enhancement Upgrade - II
• 1 slot allowing Upgrades of type Droid Structural Upgrade - I, Droid Structural Upgrade - II, or Droid Structural Upgrade - III
• 1 slot allowing Upgrades of type Combat Droid Upgrade - I, Combat Droid Upgrade - II, or Combat Droid Upgrade - III