The OnePlus 15 has outscored the iPhone 17 Pro Max and Xiaomi 17 Pro Max in a recent battery drain test. But as it turns out, Oppo has a device that outperforms the OnePlus 15 by a significant margin. In the latest battery drain test from YouTube creator Lover of Tech, Oppo’s Find X9 Pro (our review) ended up taking the win in a side-by-side rundown with OnePlus’s and Apple’s latest and best.
The test wasn’t anything exotic — just long stretches of heavy tasks chained together until the phones died. Things like shooting 4K/60fps video for an hour, endless scrolling through TikTok and Instagram Reels, YouTube playback, a bit of Subway Surfers and Asphalt, and a WhatsApp video call thrown in near the end. Once that loop finished, it started over again.
All of it was done on cellular data, which is a more realistic way to test battery life than running everything on Wi-Fi, since cellular data is significantly more resource-intensive than WiFi, and the different chipsets (A19 Pro, Dimensity 9500, and Snapdragon 8 Elite Gen 5) likely pair with different modems that vary in efficiency.
As for the results, the OnePlus 15 held up reasonably well, tapping out at 9 hours, 39 minutes, 28 seconds. That’s still more than enough for a full day, probably more like a day and a half for most people. But the Find X9 Pro stretched things out to around 11 hours. The iPhone 17 Pro Max sat at 7 hours, 37 minutes, 42 seconds.
What’s interesting here is that OnePlus made a big deal about sticking to the full 7,300mAh capacity globally. No region-specific downgrades. Oppo did the same with the X9 Pro, so these numbers should translate pretty cleanly no matter where you buy them.
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