In this comprehensive battery test, the host evaluates the performance of nine flagship smartphones to determine which has the best and worst battery life. The devices tested include the Pixel 9 Pro XL, OnePlus 13, Vivo X200 Pro, iPhone 16 Pro Max, Oppo X8 Pro, Honor Magic 7 Pro, Galaxy S25 Ultra, Galaxy S24 Ultra, and Xiaomi 14 Ultra. The test is meticulously controlled, with all phones set to 150 nits brightness, 100% battery health, and connected only to Wi-Fi to eliminate unnecessary variables. A series of applications, including social media and demanding games, are used to assess battery performance.

Key observations include the variety of processors in use, ranging from Apple's A18 Pro to Snapdragon and Mediatek chips. The Xiaomi 14 Ultra, notably, has a smaller battery than its predecessor, which raises questions about its performance. The host also employs a thermal imaging camera to analyze heat generation during usage, revealing the Pixel 9 Pro XL runs the hottest while the iPhone remains the coolest.

After conducting a standby test overnight and active usage tests, results show a significant difference in battery longevity among the devices. The Vivo X200 Pro emerges as the champion, maintaining 15% battery life after an extensive testing period, while the Xiaomi 14 Ultra disappointingly falls short, dying the quickest. The battery performance rankings convey the importance of battery capacity, chip efficiency, and software optimization in determining a smartphone's endurance.