A:Answer"You won't pay more for Apple authorized service and repairs at Best Buy. Prices may vary depending on model and type of repair needed."
from https://www.bestbuy.com/site/apple-service-repair/iphone-service-repair/pcmcat748302046186.c
A:Answerwhat do you mean at what percent? If you mean the battery health... when you go to the battery health in your iPhone, it will tell you whether your battery needs to be replaced or not. For me, I actually have my iPhone battery fully charged at 100% before I went to Bestbuy, and they just replaced it in within 1 hour. My battery health is about 70% and when I checked the battery health it said I should replaced the battery
A:AnswerIt might depend on which Best Buy store you use and how busy they are. I suggest getting an appointment and then planning to wait an hour or more for the battery changing to take place in the out of view back area where the Geek Squad is located.