My phone to be changing slow it's taking 8 hour for it to fully charge

[rameez12]

What could be the problem 

[NotAdmin]

Contact Samsung by opening the Members app, go to Support on the bottom right corner and scroll untill you see Error Report. Click on it and follow the steps

[U_C]

What charger and cable are you using?

[rameez12]

The one that came with the phone

[Amohelang]

The problem might be the cable you are using, might be worn (damaged) or you are using a charger that didn't come with the phone or one from samsung

[JonathanKasaji]

It can be
1. The phone is not original
2. The charger heard is not original
3. The charger cable is not original

NOTE THAT: If 3 of them are original then contact Samsung