OnePlus 15 vs Samsung Galaxy S25 Ultra: Best Battery vs Best Spec Sheet
OnePlus 15 won Best Battery at MKBHD's 2025 Smartphone Awards; Galaxy S25 Ultra was runner-up Phone of the Year. They sit $500 apart and answer different questions about what a 2026 flagship should be.
Updated · Verdict based on MKBHD Smartphone Awards results and spec analysis.
OnePlus 15
OnePlus · 2025 · From $899
Samsung Galaxy S25 Ultra
Samsung · 2025 · From $1299
Round wins
OnePlus 15: 2 · Samsung Galaxy S25 Ultra: 5 ·Ties: 1
Specs side-by-side
| Spec | OnePlus 15 | Samsung Galaxy S25 Ultra |
|---|---|---|
| Display | 6.82-inch LTPO AMOLED, 120Hz | 6.9-inch QHD+ AMOLED, 120Hz LTPO |
| Processor | Snapdragon 8 Elite | Snapdragon 8 Elite |
| RAM | 12GB | 12GB |
| Camera | 50MP main + 50MP ultrawide + 50MP 3x telephoto | 200MP main + 50MP ultrawide + 10MP 3x + 50MP 5x telephoto |
| Battery | 7,300 mAh | 5,000 mAh |
| OS | Android 15 (OxygenOS 15) | Android 15 (One UI 7) |
| Starting price | $899 | $1299 |
| Released | 2025 | 2025 |
Round-by-round breakdown
Battery
Winner: OnePlus 15OnePlus 15: 7,300 mAh + 100W wired charging — won Best Battery at MKBHD's 2025 awards. Galaxy S25 Ultra: 5,000 mAh + 45W wired. OnePlus wins decisively.
Display
Winner: Samsung Galaxy S25 UltraGalaxy S25 Ultra's 6.9-inch with anti-reflective coating is more legible outdoors. OnePlus 15's 6.82-inch is excellent but trails on outdoor brightness.
Performance
TieBoth Snapdragon 8 Elite. Functionally identical.
Camera
Winner: Samsung Galaxy S25 UltraGalaxy S25 Ultra: 200MP main + 5x periscope + 3x + ultrawide. OnePlus 15: triple 50MP. Samsung wins on zoom reach and processing consistency.
S Pen
Winner: Samsung Galaxy S25 UltraS Pen is a genuine Samsung differentiator. No equivalent on OnePlus.
AI features
Winner: Samsung Galaxy S25 UltraGalaxy AI is broader and more polished than OxygenOS's AI features.
Software updates
Winner: Samsung Galaxy S25 UltraSamsung: 7 years of Android updates. OnePlus: 4 years. Big gap.
Price
Winner: OnePlus 15OnePlus 15: $799. Galaxy S25 Ultra: $1,299. OnePlus is $500 cheaper.
Final verdict
Buy the OnePlus 15 if battery anxiety is your top frustration with phones — nothing else in 2026 comes close on endurance plus charging speed, and you save $500 vs the Galaxy. Buy the Galaxy S25 Ultra if you want the most polished experience, longer software support (7 vs 4 years), better cameras, and S Pen utility. The Galaxy is the better phone-as-a-product; the OnePlus is the better battery phone.
Frequently Asked Questions
OnePlus 15 vs Galaxy S25 Ultra: which to buy?
OnePlus 15 if battery and price matter most (won MKBHD's 2025 Best Battery). Galaxy S25 Ultra if you want the most capable Android (runner-up Phone of the Year at the same awards).
Is the OnePlus 15 a better value than the S25 Ultra?
On battery and chipset: yes, by a lot. On software longevity, camera, and ecosystem: no — Samsung wins. The 'better value' depends entirely on your priorities.
OnePlus 15 battery vs Galaxy S25 Ultra battery — how big is the gap?
OnePlus 15: 7,300 mAh + 100W charging = 9–11 hours screen-on. Galaxy S25 Ultra: 5,000 mAh + 45W = 8+ hours screen-on. OnePlus wins decisively.