Amazon.com: Synergy Digital Camera Battery, Works with Panasonic Lumix DC-GH5S Digital Camera, (Li-Ion, 7.4V, 2100 mAh) Ultra Hi-Capacity, Compatible with Panasonic DMW-BLF19 Battery : Electronics
ANDYCINE DMW-BLF19 Dummy Battery for Lumix DMW-BLF19 Battery Converter Compatible for Lumix DMC-GH3,DMC-GH4,DC-GH5 (V1)
Panasonic DMW-BLF19 Battery (2-Pack) by Wasabi Power
Rent a Panasonic GH5 Batteries , Best Prices | ShareGrid Atlanta, GA
Letus35 DMW-BLF19 Dummy Battery to 2-Pin Power Cable LT-GH4-2PIN
Can you use GH5 batteries in the Panasonic GH6? | Battery shooting Limitations in the Panasonic GH6 - YouTube
New S5 battery for use on GH5 also? So says Adorama. Looks like the right shape and contacts too! : r/GH5