Panasonic Battery, Grip DMW-BGGH3 (GH3 & GH4)
The Battery, Grip for Lumix GH3 and GH4 Digital Cameras from panasonic is
designed for the panasonic GH3 and GH4 digital mirrorless camera and accepts
one Lithium-Ion Battery, in addition to the Battery, in the camera body. With two
batteries installed, your shooting time is effectively doubled.