I have the HDZero box goggles pro+, I purchased a power bank off of Amazon that has the PD function which is power delivery usually 8 to 14 volts via the USB-C out connection. Only 1 of the 50 times I plugged it in it only delivered 4.5 volts on startup, I unplugged it immediately plugged it back in and it worked flawlessly. I can put the power Bank in my back pocket and add no extra weight to my goggles. I used a velcro strap to strap the cable to the headband over my shoulder so it doesn't get in the way of my arms while flying with the remote. if you want to use a power bank or a DJI USBC battery pack this is definitely an small financial investment to get big real world satisfaction from!