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Extend shooting time and enjoy a more comfortable grip with vertical compositions with the Panasonic DMW-BGG9 Battery Grip for the Lumix DC-G9 mirrorless camera. It holds a DMW-BLF19 battery in addition to the one stored in the camera body, effectively doubling the battery life. Also, it offers a vertical position shutter release button as well as standard control buttons, including a joystick, to make operation much smoother in portrait orientation. Additionally, it is splashproof, dustproof, and freezeproof to 14°F, which matches the durability of the camera.
There's an aftermarket version of this grip that supports remote control which I think is brilliant compared to this genuine one, in case anyone is interested. I have the aftermarket one and it works great.