This article analyzes Apple's device charging behavior, showing that charging speed varies in three phases—fast constant current up to 50%, tapered current to 80%, then slow trickle charge to 100%—with only the first phase significantly benefiting from a better charger. It highlights how iPhones and iPads have different optimal charging wattages, and stresses that heat and time at 100% charge impact battery health far more than charge speed, with features like Optimized Battery Charging designed to minimize battery wear by reducing time spent at full charge.
