More Power. The Sony VG-C99AM holds two NP-FM500H batteries and doesn’t have a “dummy arm” that inserts into the camera’s battery compartment. This means you can use three Sony NP-FM500H batteries at a time: one in the camera body and two in the grip’s slide-out battery tray. The grip batteries are hot-swappable, meaning you don’t have to power off the camera to replace them.
Improved Ergonomics and Controls. The VG-C99AM also serves as a vertical grip, making it popular with portrait and event photographers. It gives you more surface area to hold onto your camera, reducing the strain on your wrists when you have long sessions shooting vertical photos. It puts the shutter button right at your fingertip, and the other controls are conveniently positioned for comfortable shooting.
Solid Build. The VG-C99AM grip features the same dust- and moisture-sealed design as the Sony Alpha a99.