Hi, I have an iPhone 7 which battery life was 73. I went to a technician who switched my battery a few weeks ago. After he switched the battery life still showed 73 and the percentages still dropped fast so today he came again and switched it again, the whole story happened again. He says that the battery is original and the problem is with the iPhone motherboard. I don’t know if I should believe him anymore and I don’t know what to do… what do you think? Please don’t tell me to just buy a new phone…