I have lumia 640 xl, whenever i plug in the original charger it says "device is charging slowly (to speed up charging use the charger and cable that came with your device)" And i feel that it is charging slowly. And for additional information i have windows 10 with katest update 10586.29. Before this i had 8.1 Denim and as far i remember it does'nt had this type of problem. What should i do anyone have the permanent solution of this problem plz reply here. Thanks