The energy density of smartphone batteries is rapidly increasing, which should contribute to longer runtimes. While the iPhone 17 Pro Max packs a 4,823 mAh battery, Xiaomi’s 17 Pro Max includes a much larger 7,500 mAh cell, yet remains lighter (219 g) than Apple’s largest flagship (233 g). So it’s easy to assume that the Xiaomi 17 Pro Max would outlast the iPhone 17 Pro Max by a significant margin. But a recent battery drain test from TechDroider proved otherwise.

The test included the following phones:
- Xiaomi 17 Pro Max – 7,500 mAh
- iPhone 17 Pro Max – 4,823 mAh
- Galaxy S25 Ultra – 5,000 mAh
- Xiaomi 15 Pro – 6,100 mAh
- Pixel 10 Pro XL – 5,200 mAh
- OnePlus 13 – 6,000 mAh
The test consisted of a heavy gaming session, YouTube playback, web browsing, Instagram usage, and finally 4K video recording until the phones shut down.
While the Xiaomi did outlast every other phone in the test, the iPhone 17 Pro Max died only five minutes earlier, coming second despite having a 36% smaller battery. While the power efficiency of the A19 Pro and Snapdragon 8 Elite Gen 5 cannot be compared directly (as the two devices run on different platforms and are optimized differently), the major difference in energy content versus runtime suggests Apple has again done an incredible job with its tightly integrated hardware-software approach. Another battery drain test, involving the iPhone Air and Galaxy S25 Edge last month, also suggested the same.
The complete results were as follows:
- Xiaomi 17 Pro Max – 13 hours 36 minutes
- iPhone 17 Pro Max – 13 hours 31 minutes
- Xiaomi 15 Pro – 12 hours 31 minutes
- OnePlus 13 – 11 hours 56 minutes
- Pixel 10 Pro XL – 11 hours 28 minutes
- Galaxy S25 Ultra – 11 hours 20 minutes
While runtimes may vary depending on factors like platform-specific app optimization (for example, a game running better on iOS than Android) or network conditions (such as using a weak 5G connection instead of Wi-Fi), the test gives a good idea of where the Android phones stand relative to each other—and reinforces that the iPhone 17 Pro Max remains one of the top performers in battery endurance.
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