It has to do with what jack your are usi nag to plug the USB into. I was going through this as of today and I used a different jack and it gave out more juice so it charged. Don’t throw it away or give up on it. What I mean by jack is the plug that goes into the wall that the usb cord goes into. You have to see what it gives to your device. I was using a .85 and am now using a .3 and it’s charging fully.