I am currently using now the ZeroLemon 7500mah. I have the Samsung USB component plugged into the wall, then a USB extension cord, then the actual Samsung cord. When I have the phone on and plugged in, in the stock battery the phone still charges when I use the phone while plugged in. I noticed the ZeroLemon 7500mah battery actually depleting while plugged in while being used.
Does this happen to anyone else ? Just making sure it is not a battery issue.
It charges when I leave it alone, but when I am playing with it plugged in it is using power.