On September 18, 2025, the YouTube channel The Tech Chap carried out a battery - life test on the four models of the iPhone 17 series. The test results revealed that the iPhone 17 Pro Max came out on top, boasting a battery life of 7 hours and 58 minutes. This is almost half an hour longer than that of the iPhone 16 Pro Max.

The test was carried out in both Wi - Fi and cellular network settings. During the test, YouTube videos were played continuously. Among the models within the same series, the iPhone 17 lasted for 6 hours and 55 minutes. Due to its slim design, the iPhone 17 Air had a battery life of 6 hours and 43 minutes. The iPhone 17 Pro, on the other hand, lasted 7 hours and 34 minutes.

The enhanced battery life of the iPhone 17 Pro Max can be attributed to several hardware upgrades. For instance, the Chinese version of the phone is equipped with a 4823mAh battery. Moreover, the energy - efficiency optimizations of the A19 Pro chip, along with a VC vapor chamber cooling system, also play crucial roles. At the software level, iOS 17's strict management of background tasks helps reduce standby power consumption.

However, when compared to Android flagship phones, the iPhone 17 Pro Max still falls short in terms of fast - charging capabilities. It requires a dedicated adapter to achieve 40W fast charging.

Additionally, overseas blogger Mrwhosetheboss conducted tests that simulated real - life daily use scenarios. These scenarios included browsing social media, switching between different apps, recording videos, and playing music. These tests further confirmed the impressive battery life of the iPhone 17 Pro Max.