Sony VG-C4EM Vertical Grip
Dedicated to the Sony Alpha a7R IV, a7S III, and a9 II mirrorless cameras, the grip offers both extended battery and a more comfortable grip when shooting in the vertical orientation.
The grip accepts either one or two NP-FZ100 batteries to increase the effective battery life for longer shooting sessions, and the batteries can be charged in the grip while attached to the camera via the body's USB port.