V-02HD: How to Setup a Battery
Tilta (DC cable not included):
7V out is a 5.5/2.1 jack
Then just get a polarity reverser
The V-02HD power jack is a 5.5/2.1, center negative connector:
This is the same size as the plug on the PSB-1U it comes with, which is a 9V power supply.
You likely need a custom power cable that converts the wiring if the plug sizes are correct on both ends. They may need to be reversed on one of the ends, but please wait until I can review the plate and cable you are using and confirm.
Please let me know more about your battery adapter you currently have. It's likely center positive, and would just need a polarity converter cable: https://www.amazon.com/SoulBay-Reverse-Polarity-Converter-Guitar/dp/B075R64SCQ
I see it outputs roughly 15V, so it will drain the batteries a little faster than the 7V tap I showed you, but should work.
The V-02HD only draws 10W max, so it should not overload the battery plate or power cable or polarity cable.
Please let me know more about the brand and model of your battery plate, and I will check with their support team.