BG-81 lived on the planet Shantipole where it assisted the Mon Calamari starship engineer Quarrie, with the construction of his Prototype B6, which later became the basis for the Rebel Alliance's B-Wing. BG-81 was present when the Spectres Hera Syndulla, Sabine Wren, and Garazeb Orrelios arrived on Shantipole to test the new starfighter.
The astromech droid was present when Hera flew Prototype B-6 for a test flight above the canyons of Shantipole. Later, the droid and Quarrie were aboard the rebel shuttle Phantom when Hera used the prototype starfighter to break through the Galactic Empire's blockade of Ibaar. Following the skirmish, BG-81 left the rebel fleet with Quarrie in order to oversee the production of more B-Wings for the rebel cause.
BG-81 was an Lothal astromech droid who served the Mon Calamari starship engineer Quarrie. It aided Quarrie with the construction of the experimental Prototype B6 starfighter. BG-81 was present both during the starship's test flight and the first field operation.