Galaxy S26 Ultra: Better Thermals & 12% Longer Battery Than S25

Key Takeaways

1. The Galaxy S26 Ultra has minimal hardware upgrades compared to its predecessor, with the notable feature being the Privacy Display.

2. Its 5,000 mAh battery offers a runtime of 12 hours, positioning it third in performance compared to competitors like OnePlus 15 and Oppo Find X9 Pro.

3. The device excels in thermal management, maintaining a cool temperature of around 27°C during battery life tests, unlike competitors that overheated.

4. Despite having a smaller battery than its rivals, the S26 Ultra only lags behind in runtime by 7%, showcasing efficient optimization.

5. Overall, Samsung has successfully balanced battery life and thermal performance in the Galaxy S26 Ultra, warranting a reassessment of the device despite initial criticisms.

Fans and the media have really criticized Samsung for not including more hardware upgrades in the Galaxy S26 Ultra. The design and camera features of the Galaxy S26 Ultra introduce only a few new elements, with the standout being the impressive Privacy Display. Nevertheless, specifications alone do not reveal the whole picture, especially when it comes to the battery life and thermal efficiency of the Galaxy S26 Ultra.

Battery Performance Comparison

Although the Galaxy S26 Ultra’s 5,000 mAh battery is not as powerful as the 7,000+ mAh batteries found in the OnePlus 15 and Oppo Find X9 Pro, Samsung has seemingly optimized the battery life and thermal management of the Galaxy S26 Ultra quite effectively. In tests conducted by Mrwhosetheboss, the Galaxy flagship achieved a runtime of 12 hours, securing the third position. The Oppo Find X9 Pro and OnePlus 15 took the first two places with impressive runtimes of 14 hours 16 minutes and 12 hours 55 minutes, respectively.

Competitors’ Performance

Trailing behind the Galaxy S26 Ultra, the iPhone 17 Pro Max managed to last 28 minutes less. The Xiaomi 17 Ultra also struggled, only reaching 11 hours 27 minutes despite housing a 6,000 mAh battery. Meanwhile, the Galaxy S25 Ultra and the Pixel 10 Pro XL fell behind the pack, with runtimes of just 10 hours 43 minutes and 9 hours 53 minutes, respectively.

Thermal Management Success

What stands out, though, is that both the Galaxy S26 Ultra and iPhone 17 Pro Max kept their cool during testing, maintaining temperatures around 27°C while measuring battery life. In contrast, other models, like the Google Pixel 10 Pro XL, heated up to 32°C during the tests.

Mrwhosetheboss noted similar thermal behavior under heavy usage. After gaming and completing three rounds of Geekbench, the Galaxy S26 Ultra and iPhone 17 Pro Max remained the coolest options. The Oppo Find X9 Pro, however, struggled the most, hitting temperatures of 42°C.

Conclusion

It appears that Samsung has effectively managed battery life and thermal performance in the Galaxy S26 Ultra. Even with a battery 32% smaller than that of the OnePlus 15, the Galaxy S26 Ultra only lags behind by 7% in battery life—all while operating at a much cooler temperature.

If you were disheartened by the Galaxy S26 Ultra due to its less impressive hardware specs, it might be time to take another look at the Galaxy S26 Ultra with a fresh perspective.

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