Hello friends acc. to my experience on power banks l feel that l have to give some tips to you so that you can not use such type of power banks.
In communication field power banks are unuseful specially Samsung power banks as l used it for three months .lt was completely bad, lt charged mobile very slowly and it, s price is also very high.lt is not value for money product.
In three months lt defected five times and l have to repair it by spend money on it.lt also decreses the battery efficiency of mobiles.
So guys my tip to you is that do not ever buy POWER BANKS especially samsung power bank And charge your mobiles from it.
They are wastage of time and nothing.This is my advice to you.
Thank you