Hello friend, I'm sorry to have caused you a bad feeling. There are two reasons for the issue you reported: 1. The product needs to be fully charged before use, as transportation may take time and the battery may be damaged. 2. This product was originally intended for emergency use, and its positioning is not a large capacity battery. Therefore, as a powerbank for emergency use, it generally does not fully charge the phone, but only serves as an emergency But as your supplier, I am very willing to help you solve the problem, so I hope you can explain to the customer. I will prepare some gifts for you in the next order, and you can give them as gifts to your customers. I hope it can help you establish a longer cooperation relationship with your customers.