Battery pack worked awesome charged my phone completely when I was at beach and had no charger and my iPhone was almost dead. It charged it to full battery in short amount of time. The one thing I do not like about it Is I have multiple iPhone chargers and now none of those work because this uses its own kind of charger. So I’m only going to use this as a back up case keep it charged in the car When I need it then use it. I didn’t take off any stars because the charger did what it was supposed to !