Iphone charges very very slowly but no charging icon
I plug my iphone 5c 8gb with my authentic iphone charger and it will charge very very slowly, however it will not show that it is charging. By slow I mean 20% in around 24 hours. Is there anything I can do? I tried charging with a different adapted and there was no difference. So it must mean its my phone or my usb charger right?
iPhone 5c, iOS 9.3.2

