found at DigiDirect
The Kondor Blue 1.35/3.5 DC Male to Sony A7SIII Dummy Battery NP-FZ100 Cable is a coiled power cable that allows you to connect select Sony cameras to Kondor Cine V-mount and Gold mount battery plates, allowing you to leave the D-Tap ports of the battery plates available for accessories.
This NP-FZ100 dummy battery is compatible with the Sony a9 II, a9, a7R IV, a7R III, a7 III, a7S III, and a6600 cameras.
When relaxed, the cable is 16 long and can be easily managed, and it stretches to 36 long when you need the additional length. It plugs into the smallest DC port on the Kondor battery plate and the cable outputs regulated power at 8V. The power regulator is neatly tucked away in the dummy battery, so it doesn't interfere with the cable.