Neewer Battery Grip Compatible with Panasonic Lumix G9 $35.18 + Delivery ($0 with Prime/ $39 Spend) @ Neewer via Amazon AU

Amazon Lightning deal, good price, good user ratings. A genuine Panasonic grip costs 10 times as much! Don't forget to use Cash Rewards/Shopback.

Neewer Battery Grip Compatible with Panasonic Lumix G9 Camera Replacement for DMW-BGG9 with Shutter Release Focus Point Control Joystick Work with 1 DMW-BLF19E Li-ion Battery (Battery Not Included)

COMPATIBILITY: Compatible with Panasonic LUMIX G9; It can hold 1 piece DMW-BLF19E Li-ion Battery, doubling the battery capacity for more shooting time (Note: Battery and camera NOT Included in the package)
TRIPOD MOUNT: 1/4-inch screw hole at the bottom allows you to mount the grip on a tripod
MULTI-FUNCTION CONTROL: Same function on the grip as the camera, it will not affect any function of the original camera; Professional battery grip with shutter release button, front and rear control dial, AF/AE LOCK button, ISO sensitivity button and WB (White Balance) button so as to realize more comfortably vertical shooting
EXCELLENT STABILITY: Easy install and uninstall; Vertical shutter release botton is convenient to operate; the grip of frosted materials helps improve shooting stability
PERSONILIZED DESIGN: Ergonomic design coupled with high quality coating made of premium plastic provide comfortable grip and perfect shooting experience