Hi! I bought the USB power supply in the picture above, and connected it directly to my battery. I want to be able to use my phone as a GPS so I need to keep it charged on long rides. The issue I am having is that after installing the USB power supply and then connecting my iPhone, the phone indicates that it is being charged, however, the charge percentage will not go up. I tested this several times riding around the city, while running the GPS app, the battery charge on my phone slowly went down, and while the phone was off, the charge percentage stayed constant. Both times, the phone had an icon indicating it was being charged.
Does anyone know why this is happening? Is it because the battery of the ninja 300 will not output enough power?
P.S. I also tried installing it to a switchable power source like the tail light, I had the same issue.