The iPhone 15 Pro Max has a slightly larger battery capacity than its immediate predecessor, the iPhone 14 Pro Max, and also uses USB-C, whereas last year’s model used Lightning. Despite these differences, Apple's latest flagship still charges at the same speed, according to multiple tests.
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Apple Online Store (China)
According to data collected by ChargerLAB, Apple has once again limited the maximum charging speed of the iPhone 15 Pro Max to 25.5W. This maximum supported power is the same as the iPhone 14 Pro Max, which is puzzling because the addition of a USB-C port usually means manufacturers have more flexibility in increasing maximum charging throughput. The company may have limited the power of the iPhone 15 Pro Max to 25.5W because it hopes the battery will decay more slowly.
On the latest iPhone 15 models, Apple has also added three new battery features: optimized battery charging, 80% limit, and turning off this feature, which can help reduce battery consumption over a longer period of time, depending on which setting the user chooses. The test showed that a variety of official Apple chargers were used in the test, ranging from a 20W charging head to a 140W MacBook Pro battery charger. Although the iPhone 15 Pro Max is compatible with all chargers, its peak charging limit is approximately 25.5W.
Tests also show that this 6.7-inch phone is compatible with almost all third-party USB-PD chargers, among which the Lenovo thinkplus 65W power module provides the highest power of 26.2W to the iPhone 15 Pro Max. There are also three chargers that exceed the 26W threshold for charging, but there is little wiggle room for exceeding that regardless of which accessory you use.