Gamepad bluetooth compatible Battle bay?

Battle Bay is not compatible with external gamepads unfortunately. While you can use gamepad-to-touch mapping software, the nature of having to control ship direction, camera orientation, and perform fine aiming means that you'd have to either make a rather complicated overlay or forsake one of those adjustments.

Eg: You could map LS to the ship controls, RS to an open area of camera, and then perhaps have a "hold RT" modifier to move your RS to the fine-aiming reticle. You'd then need to map buttons to each weapon/item, as well as having something like "hold LT" for the communications wheel.

(Short answer: No. Sorry.)