I am from Philippines. I bought Powercore Speed 20,000 mah last February 2018. Yesterday, March 4, 2018,I charged my 2 days old Samsung Galaxy J7 Core. When it reaches 75% it suddenly stops! What shall I do? Is it normal?
1) Try different cable2) Try different charger3) email email@example.com with order details, product serial number, evidence you did the two steps above, and they will resolve your issue.
Did you purchased on Aliexpress?