Based on real-life bats, BBats have a grey torso, a black mouse-like head with round ears and black eyes, and wide grey metallic wings with grey claws at the joints. They also have a rocket exhaust instead of legs to aid them with flight.
BBats were originally going to appear in the Hidden Palace Zone, but the Zone and its Badniks were both cut from the final game. Regardless, the BBats could still be found in the Nick Arcade and Simon Wai prototypes. Here, their attack pattern consists of hanging on ceilings until the player gets underneath them, upon where they swoop down in a U-shaped arc, ideally hitting the player at the lowest point of the arc. If the player dodges this attack, the BBat will fly in one place and repeat its attack from the other side.
In the Nick Arcade and Simon Wai prototypes of Sonic the Hedgehog 2, the BBat, along with the Redz, are the only Badniks in the game to reappear on-screen after they have been destoyed if the player returns to the said Badniks' locations.