The Precision BG-P1 Battery Grip can be used on either the GH4 or GH3, and is able to hold an additional lithium-ion battery for doubling your shooting times. The battery grip's design also incorporates additional camera controls and an alternate shutter release button for easier handling when shooting in the vertical orientation. Enabling the use of this grip, or also available as a spare, this kit also includes a Watson DMW-BLF19 lithium-ion battery pack.