Galaxy S26 Ultra’s 5,000mAh battery tested against 7,000mAh+ giants
It’s been over half a decade since Samsung last increased the battery capacity of its top-tier Galaxy S flagship. The company moved to a 5,000mAh cell with the Galaxy S20 Ultra back in 2020, and that figure remains unchanged in the newly launched Galaxy S26 Ultra. Instead of increasing raw capacity, Samsung is leaning on improved efficiency from the latest Snapdragon, along with performance tuning in One UI 8.5.

Meanwhile, Chinese brands like Xiaomi, OnePlus, and Honor have taken a very different approach. Their latest flagships pair the same chipset with high-energy-density batteries with capacities over 7,000mAh. So naturally, the big question is where the Galaxy S26 Ultra stands against these rivals when it comes to battery life. A recent battery drain comparison by Tech Droider attempts to put that into perspective.
The test simulated mixed real-world usage such as browsing, video playback, gaming, camera work, and the Galaxy S26 Ultra lasted 9 hours and 8 minutes. That’s actually a step up from last year’s S25 Ultra, which stopped at around 8 hours and 40 minutes in the same test. So there is progress, even if it’s not dramatic.
Where things get interesting is in the comparison. The iPhone 17 Pro Max crossed 9 hours and 41 minutes. Xiaomi’s 17 Pro Max pushed just past 10 hours. And the OnePlus 15 stretched all the way to 12 hours and 31 minutes.
That gap isn’t hard to explain. Battery size plays a role, and a big one. The OnePlus 15 carries a 7,300mAh battery, and Xiaomi’s flagship goes up to 7,500mAh. With that kind of capacity advantage, endurance gains start to look less surprising.
The pattern is becoming clearer year after year. Efficiency tweaks help, but they only go so far when rivals are increasing raw capacity by 30–40 percent.
Samsung has hinted at possible silicon-carbon adoption in future models, which could allow for larger batteries without adding bulk. If that happens, the balance may shift. For now, though, the S26 Ultra remains competitive rather than class-leading in endurance.
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