Why is my galaxy s6 edge plus not charging and sometimes shuts off

[AC Question]

okay so one day i used a charger my sisters friend left over her apartment and ever since then my phone has been acting really weird, it went into a blue screen that said downloading and it would never go away till i hit the command buttons on my phone, which is down button, home button, and power button all at the same time, so i went ahead and did a factory data reset on my phone which i thought would help but apparently it didnt. So now everytime i try to plug in my charger it asks me to download a battery sharing app wich i dont even know what that is can anyone help me!!!!!!