Apple authorized repair shops are the worst. They have so many rules imposed by Apple that they can't provide good service. An iPhone battery swap at an author

Apple authorized repair shops are the worst. They have so many rules imposed by Apple that they can't provide good service. An iPhone battery swap at an authorised reseller can take a week (!). Non-authorised repair shops can often offer better service -- often they can replace a battery in 20 minutes. That's faster than at the Apple store. (but of course, if something goes wrong, there's probably no warranty)