I have a EOS RP and would like to charge ( run off external battery ) direct to the camera. I tried to hook up my power bank with USB cable to camera but nothing. Seems so simple but my guess is Canon sells their own special cable with "propriety" technology Any suggestions? Anker Portable Charger, 313 Power Bank (PowerCore Slim 10K) 10000mAh Battery Pack with High-Speed PowerIQ Charging Technology and USB-C (Input Only) for iPhone, Samsung Galaxy, and More