It is the capacity published by Apple. Apparently some regulatory bodies [1] require that information.
[1] https://www.mysmartprice.com/gear/mobiles/mobiles-news/apple...
But it is an interesting question: What is the manufacturing tolerance? Naively I had assumed that it's much smaller than a watt-hour. But that's based on ~no knowledge :D
But it is an interesting question: What is the manufacturing tolerance? Naively I had assumed that it's much smaller than a watt-hour. But that's based on ~no knowledge :D