For Panasonic Lumix DMC-GH3, DMC-GH4 / DC-G9, DC-GH5, DC-GH5S DC-GH5M2. DMW-BLK22 USB-C Battery for Panasonic Lumix. Inbuilt into each Dot.Foto battery is a safety system which gives short circuit protection and prevents the battery from overheating.
eBay