Why is my Samsung Galaxy J3 (2016) only charging up to a certain percentage?

I have a Samsung Galaxy J3 (2016) I have recently lost my charger and I am using one that I had for one of my old phones it charges my phone only to 69% It shows it to still be charging but after an hour or so  it's still on 69% why is that? 




I suggest that you try using a different set of charger first. Also, try charging your phone while it's off. Let us know how it goes.



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