Code found in iOS 27 suggests the iPhone 18 Pro and iPhone 18 Pro Max could support a 33% higher charging rate than the iPhone 17 Pro models, according to a new discovery from the leaker known as "pdfu."
The findings apparently come from Apple's charging optimizer settings buried in iOS 27, which show the iPhone 18 Pro and iPhone 18 Pro Max charging at a rate 33% higher than the iPhone 17 lineup. If Apple can maintain that higher rate throughout a charge, pdfu estimates it could cut around 25% off the time it takes to complete a typical fast-charging session.
Apple's first foldable iPhone does not appear to get the same treatment. The same code purportedly shows it charging at the same rate as the iPhone 17 and iPhone 17 Pro, rather than the faster rate expected for the new Pro models.
The research also points to further charging improvements arriving with future models. The standard iPhone 18 is said to match the iPhone 18 Pro faster charging, while the iPhone 18e is said to see an even bigger jump of around 69% over the current iPhone 17e. The iPhone Air 2 is said to charge about 27% faster than today's iPhone Air.
Actual charging speeds depend on a multitude of real-world factors, such as the phone's temperature and how full the battery already is, so the improvement buyers notice day-to-day could end up being smaller than the numbers suggest.
Apple is expected to unveil the iPhone 18 Pro and iPhone 18 Pro Max, along with its first foldable iPhone, at its "Surprise and shine" event today, while the iPhone 18e, iPhone 18, and iPhone Air 2 are rumored to follow in the spring of 2027.
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