Power your B-mount device with a powerful 2F1-style battery with this 2F1-Style Battery to B-Mount Adapter Plate from BlockBattery. Mount this plate on the back of your camera's B-mount or to the B-mount of an LED fixture and create an instant single-slot mount for powerful, long-life options, such as the separately available Power Couple 98Wh or the 2F1-150 150Wh battery.