From Manufacturer
Make sure you have the power you need for a long day of intense high-speed shooting with this Action Shooting Kit from B&H which stars the blazing fast Sony Alpha a9 Mirrorless Digital Camera. The kit provides the camera with both the VG-C3EM Vertical Grip for extended power and comfort and the NPA-MQZ1K Multi Battery Adapter Kit, which functions as an external power pack able to accept up to four NP-FZ100 batteries or a rapid charger.