Solder points for external 5v/3.3v power?

[nlh92]

Hi,

I want to use this controller wireless and power it externally without plugging in a USB cable. Where would I connect/solder a 5v or 3.3v cable and ground to power it on?

Looking at this https://www.acidmods.com/forum/index.php/topic,43204.0.html I can only think to solder it to the usb port pin or maybe the J1/J5 connector pin 8?

Thank you!