NP-F battery/power source for Yongnuo YN-300

I bought LED lights Yongnuo YN-300 II here:
https://www.amazon.de/Yongnuo-OS03221-Videolicht-Kameralicht-Videokamera/dp/B00DYVSMHA/ref=sr_1_2?ie=UTF8&qid=1551285082&sr=8-2&keywords=yn-300

Just to realise that it is not possible to plug it from the power source, but only NP-F batteries. So I made a simple "fake NP-F battery" :D

Design is simple, I am not really good with designing things, but it does work perfectly good. I ordered power source 9V 6A so I can power up two of this lights no