Here we have a Panasonic DMW-BGGH5. The item is in like new condition and working as new in all respects. So, I am going to clarify the actual process after you buy an item from The Digital Frontier.
eBay
Z6III Battery Grip MB-N14 Replacement Vertical Grip for Nikon Z6III Z63 Battery Grip
Aliexpress UK
Applicable Model: For Panasonic GH5. Comfortable Vertical Shooting: Crafted for optimal comfort, the grip allows for effortless vertical shooting. It reduces hand fatigue and ensures a steady grip, enabling you to maintain precision and stability for extended periods.
eBay
BG-R10 Vertical Battery Grip Holder w/ Dual Battery Slots for Canon EOS R5/R6/R5C/R6 mark ii Battery Grip LP-E6NH/ LP-E6N/ LP-E6
Aliexpress UK
The Neewer Panasonic GH5 Battery Grip is a third-party accessory designed specifically for Panasonic cameras. Made from durable plastic in a sleek black colour, this grip features a snap-on mount type and accessory compartments for added convenience. Compatible with Panasonic LUMIX series cameras, this grip offers a reliable and practical solution for extended shooting sessions.
eBay
DMW-DCC17 DMW-BLK22 Dummy Battery PD 20W Power Adapter For Panasonic Lumix G9 DC-S5K DC-S5 GH5S GH5 II GH6 Camera Charger
Aliexpress UK
Panasonic DMW-BGGH5 battery grip works with the GH5 and GH5s. Good condition, never really used. Battery grip and box No battery included
eBay
2280mAh DMW-BLK22 Battery& Dual Charger for Panasonic Lumix DC-S5 DC-S5 II DC-S5 IIX GH5 II GH6 S5II S5IIX S5M2 S5M2X GH5M2
Aliexpress UK
Applicable Model: For Panasonic GH5. Comfortable Vertical Shooting: Crafted for optimal comfort, the grip allows for effortless vertical shooting. It reduces hand fatigue and ensures a steady grip, enabling you to maintain precision and stability for extended periods.
eBay
PD Type USB C DMW-BLK22 Dummy Battery Power Adapter For Panasonic Lumix G9 DC-S5K DC-S5 GH5S GH5 II GH6 Camera Charger
Aliexpress UK
Neewer Panasonic LUMIX GH5 battery grip. This is not the official Panasonic version, but a third party alternative instead. No batteries included. Fully working.
eBay
DMW-DCC12 GH5 GH4 Dummy Battery USB-C Adapter for Panasonic Lumix DC-G9 DMC-GH3 GH3K GH4K GH3H GH4H G9 G9L G9K
Aliexpress UK
Muliti function grip with vertical-grip shutter-release button, AE/AF lock button, ISO sensitivity button, White balance button and Exposure compensation button etc. 1x Battery Grip.
eBay
DMW-AC10 DMW-DCC12 AC Power Adapter DMW-BLF19 Dummy Battery for Panasonic Lumix DC-G9 GH5 GH5s DMC-GH4 GH4H GH3 GH3H Cameras
Aliexpress UK
Applicable Model: For Panasonic GH5. Comfortable Vertical Shooting: Crafted for optimal comfort, the grip allows for effortless vertical shooting. It reduces hand fatigue and ensures a steady grip, enabling you to maintain precision and stability for extended periods.
eBay
smallrig DMW-BLK22 USB-C Rechargeable Camera Battery For Panasonic 7.2V 2520mAh 18.15Wh power bank For LUMIX GH7 GH6 GH5 II S9
Aliexpress UK