Which has the bigger battery, the Apple iPhone 16 Pro Max or the Xiaomi 15?

The Xiaomi 15 has the bigger battery: 5,240 mAh against 4,685 mAh. Real battery life also depends on the chip and screen.

Apple iPhone 16 Pro Max vs Xiaomi 15

The Apple iPhone 16 Pro Max is 10.7 mm taller, 6.4 mm wider and 36 g heavier than the Xiaomi 15. Its screen is 0.54" larger.

Body	Apple iPhone 16 Pro Max	Xiaomi 15
Size	163 × 77.6 × 8.3 mm	152.3 × 71.2 × 8.1 mm
Thickness	8.3 mm	8.1 mm
Weight	227 g	191 g? (better)
Frame	titanium	aviation-grade aluminum1
Back	textured matte glass	—
Water resistance	IP68	IP68
Colours	Black Titanium, White Titanium, Natural Titanium, Desert Titanium	Liquid Silver, White, Black, Green

Performance and software	Apple iPhone 16 Pro Max	Xiaomi 15
Chipset	A18 Pro	Snapdragon 8 Elite Mobile Platform
CPU	6-core (2 performance + 4 efficiency)	2 x Prime Core up to 4.32GHz, 6 x Performance Core up to 3.53GHz
Process	—	3 nm
Ships with	iOS	Xiaomi HyperOS 2

Memory	Apple iPhone 16 Pro Max	Xiaomi 15
RAM	8 GB	8 GB / 12 GB / 16 GB (better)
Storage	256 GB / 512 GB / 1 TB	256 GB / 512 GB / 1 TB

Cameras	Apple iPhone 16 Pro Max	Xiaomi 15
Rear	48 MP Main, OIS 12 MP Telephoto (5× optical), OIS 48 MP Ultrawide	50 MP Main 50 MP Telephoto 50 MP Ultrawide
Main camera	48 MP	50 MP
Optical zoom	5× (better)	None
Front	12 MP	32 MP
Video	4K Dolby Vision at 120 fps	8K (7680x4320) at 24/30fps

Features	Apple iPhone 16 Pro Max	Xiaomi 15
Fingerprint	—	Ultrasonic in-screen
Stereo speakers	—	Yes

Highlighted: the better value where one is clearly better. Sources for each phone are listed on the Apple iPhone 16 Pro Max and Xiaomi 15 pages.

Is the Apple iPhone 16 Pro Max bigger than the Xiaomi 15?: The Apple iPhone 16 Pro Max is 10.7 mm taller, 6.4 mm wider and 36 g heavier than the Xiaomi 15. Its screen is 0.54" larger.
Which has the bigger battery, the Apple iPhone 16 Pro Max or the Xiaomi 15?: The Xiaomi 15 has the bigger battery: 5,240 mAh against 4,685 mAh. Real battery life also depends on the chip and screen.