Apple’s special offer on battery replacement for used iPhones has resulted in ten times more batteries being replaced than usual.
As John Gruber writes on Daring Fireball, Tim Cook mentioned this in an interview with his staff. He also mentioned the fact that the low exchange prices had led to an increase from 1-2 million batteries normally exchanged to 10 million units – a factor of ten.
This means that there are ten million iPhones that work just like on the first day – also because they are all models that also run the latest iOS 12. Of course, this is great for the environment and your wallet. Not so much for Apple’s sales of newer models, of course.