Model: B8S. Obstacle Avoidance Device 1. Original 3.7V 1600mAh Battery Spare Accessory for 4DRC V34 Drone. Original 11.4V 8000mAh Battery Spare Parts for AE86 Pro Max+ Drone Quadcopter. Original 3.7V 1800mAh Battery Spare Accessories for S156 Drone Quadcopter.