Xiaomi 15 Ultra vs Samsung Galaxy S25 Ultra: A Battle of Endurance and Speed
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🏆 Quick Verdict
For the average user, the Xiaomi 15 Ultra emerges as the winner. Its dramatically superior battery endurance (58:58h vs 44:54h) and significantly faster charging (90W wired, 80W wireless) outweigh the Galaxy S25 Ultra’s brighter display, making it the more practical choice for power users.
| PHONES | ||
|---|---|---|
| Phone Names | Xiaomi 15 Ultra | Samsung Galaxy S25 Ultra |
| Network | ||
|---|---|---|
| 2G bands | GSM 850 / 900 / 1800 / 1900 | GSM 850 / 900 / 1800 / 1900 |
| 3G bands | HSDPA 800 / 850 / 900 / 1700(AWS) / 1900 / 2100 | HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 |
| 4G bands | 1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 25, 26, 28, 32, 38, 39, 40, 41, 42, 48, 66, 71 - International | 1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 25, 26, 28, 32, 38, 39, 40, 41, 66 - International |
| 5G bands | 1, 2, 3, 5, 7, 8, 12, 20, 25, 26, 28, 38, 40, 41, 48, 66, 71, 75, 77, 78, 79 SA/NSA - International | 1, 2, 3, 5, 7, 8, 12, 20, 25, 26, 28, 38, 40, 41, 66, 75, 77, 78 SA/NSA/Sub6 - International |
| Speed | HSPA, LTE, 5G | HSPA, LTE (up to 7CA), 5G |
| Technology | GSM / HSPA / LTE / 5G | GSM / CDMA / HSPA / EVDO / LTE / 5G |
| Launch | ||
|---|---|---|
| Announced | 2025, February 27 | 2025, January 22 |
| Status | Available. Released 2025, February 27 | Available. Released 2025, February 03 |
| Body | ||
|---|---|---|
| Build | Glass front, fiber-reinforced plastic back or silicone polymer back (eco leather), aluminum frame | Glass front (Corning Gorilla Armor 2), glass back (Gorilla Glass Victus 2), titanium frame (grade 5) |
| Dimensions | 161.3 x 75.3 x 9.4 mm (6.35 x 2.96 x 0.37 in) | 162.8 x 77.6 x 8.2 mm (6.41 x 3.06 x 0.32 in) |
| SIM | · Nano-SIM + Nano-SIM· Nano-SIM + Nano-SIM + eSIM + eSIM (max 2 at a time) | · Nano-SIM + Nano-SIM + eSIM + eSIM (max 2 at a time) - INT· Nano-SIM + eSIM + eSIM (max 2 at a time) - USA· Nano-SIM + Nano-SIM - CN |
| Weight | 226 g or 229 g (7.97 oz) | 218 g (7.69 oz) |
| Display | ||
|---|---|---|
| Protection | Xiaomi Shield Glass 2.0, Mohs level 6 | Corning Gorilla Armor 2, Mohs level 6 |
| Resolution | 1440 x 3200 pixels, 20:9 ratio (~522 ppi density) | 1440 x 3120 pixels, 19.5:9 ratio (~498 ppi density) |
| Size | 6.73 inches, 108.9 cm2 (~89.7% screen-to-body ratio) | 6.9 inches, 116.9 cm2 (~92.5% screen-to-body ratio) |
| Type | LTPO AMOLED, 68B colors, 120Hz, 1920Hz PWM, Dolby Vision, HDR10+, HDR Vivid, 3200 nits (peak) | Dynamic LTPO AMOLED 2X, 120Hz, HDR10+, 2600 nits (peak) |
| Platform | ||
|---|---|---|
| CPU | Octa-core (2x4.32 GHz Oryon V2 Phoenix L + 6x3.53 GHz Oryon V2 Phoenix M) | Octa-core (2x4.47 GHz Oryon V2 Phoenix L + 6x3.53 GHz Oryon V2 Phoenix M) |
| Chipset | Qualcomm SM8750-AB Snapdragon 8 Elite (3 nm) | Qualcomm SM8750-AC Snapdragon 8 Elite (3 nm) |
| GPU | Adreno 830 | Adreno 830 (1200 MHz) |
| OS | Android 15, up to 4 major Android upgrades, HyperOS 2 | Android 15, up to 7 major Android upgrades, One UI 7 |
| Memory | ||
|---|---|---|
| Card slot | No | No |
| Internal | 256GB 12GB RAM, 512GB 16GB RAM, 1TB 16GB RAM | 256GB 12GB RAM, 512GB 12GB RAM, 1TB 12GB RAM, 1TB 16GB RAM |
| Main Camera | ||
|---|---|---|
| Features | Laser AF, color spectrum sensor, Leica lenses, Dual-LED flash, HDR, panorama, 67mm filter ring holder (optional) | Laser AF, Best Face, LED flash, auto-HDR, panorama |
| Quad | 50 MP, f/1.6, 23mm (wide), 1.0"-type, 1.6µm, dual pixel PDAF, OIS 50 MP, f/1.8, 70mm (telephoto), 1/2.51", 0.7µm, dual pixel PDAF (10cm - ∞), OIS, 3x optical zoom 200 MP, f/2.6, 100mm (periscope telephoto), 1/1.4", 0.56µm, multi-directional PDAF, OIS, 4.3x optical zoom 50 MP, f/2.2, 14mm, 115˚ (ultrawide), 1/2.76", 0.64µm, dual pixel PDAF TOF 3D, (depth) | 200 MP, f/1.7, 24mm (wide), 1/1.3", 0.6µm, multi-directional PDAF, OIS 10 MP, f/2.4, 67mm (telephoto), 1/3.52", 1.12µm, PDAF, OIS, 3x optical zoom 50 MP, f/3.4, 111mm (periscope telephoto), 1/2.52", 0.7µm, PDAF, OIS, 5x optical zoom 50 MP, f/1.9, 120˚ (ultrawide), 1/2.5", 0.7µm, dual pixel PDAF, Super Steady video |
| Video | 8K@30fps, 4K@30/60/120fps, 1080p@30/60/120/240/480/960/1920fps, gyro-EIS, Dolby Vision HDR 10-bit rec. (4K@60fps, 1080p) | 8K@24/30fps, 4K@30/60/120fps, 1080p@30/60/120/240fps, 10-bit HDR, HDR10+, stereo sound rec., gyro-EIS |
| Selfie camera | ||
|---|---|---|
| Features | HDR, panorama | HDR, HDR10+ |
| Single | 32 MP, f/2.0, 21mm (wide), 1/3.14", 0.7µm | 12 MP, f/2.2, 26mm (wide), 1/3.2", 1.12µm, dual pixel PDAF |
| Video | 4K@30/60fps, 1080p@30/60fps, gyro-EIS | 4K@30/60fps, 1080p@30fps |
| Sound | ||
|---|---|---|
| 35mm jack | No | No |
| Loudspeaker | Yes, with stereo speakers | Yes, with stereo speakers |
| Comms | ||
|---|---|---|
| Bluetooth | 6.0, A2DP, LE, aptX HD, aptX Adaptive, LHDC 5 | 5.4, A2DP, LE |
| Infrared port | Yes | - |
| NFC | Yes | Yes |
| Positioning | GPS (L1+L5), BDS (B1I+B1c+B2a), GALILEO (E1+E5a), QZSS (L1+L5), NavIC (L5), GLONASS | GPS, GLONASS, BDS, GALILEO, QZSS |
| Radio | No | No |
| USB | USB Type-C 3.2 Gen 2, DisplayPort, OTG | USB Type-C 3.2, DisplayPort 1.2, OTG |
| WLAN | Wi-Fi 802.11 a/b/g/n/ac/6e/7, dual-band or tri-band, Wi-Fi Direct | Wi-Fi 802.11 a/b/g/n/ac/6e/7, tri-band, Wi-Fi Direct |
| Features | ||
|---|---|---|
| Sensors | Fingerprint (under display, ultrasonic), accelerometer, proximity, gyro, compass, barometer | Fingerprint (under display, ultrasonic), accelerometer, gyro, proximity, compass, barometer |
| Battery | ||
|---|---|---|
| Charging | 90W wired, PD3.0, QC3+ 80W wireless 10W reverse wireless | 45W wired, PD3.0, 65% in 30 min 15W wireless (Qi2 Ready) 4.5W reverse wireless |
| Type | Market-dependent versions:· Si/C Li-Ion 5410 mAh - Global· Si/C Li-Ion 6000 mAh - China | Li-Ion 5000 mAh |
| Misc | ||
|---|---|---|
| Colors | Black, White, Silver Chrome, Green | Titanium Silver Blue, Titanium Black, Titanium White Silver, Titanium Gray, Titanium Jade Green, Titanium Jet Black, Titanium Pink Gold |
| Models | 25010PN30G | SM-S938B, SM-S938B/DS, SM-S938U, SM-S938U1, SM-S938W, SM-S938N, SM-S9380, SM-S938E, SM-S938E/DS |
| Price | $ 1,328.84 / £ 889.00 / € 1,099.00 | € 895.00 / $ 859.98 / £ 799.99 / ₹ 110,498 |
| SAR | - | 1.26 W/kg (head) 0.64 W/kg (body) |
| SAR EU | 1.00 W/kg (head) 1.00 W/kg (body) | 1.25 W/kg (head) 1.42 W/kg (body) |
| EU LABEL | ||
|---|---|---|
| Battery | 58:58h endurance, 1000 cycles | 44:54h endurance, 2000 cycles |
| Energy | Class A | Class B |
| Free fall | Class C (90 falls) | Class A (270 falls) |
| Repairability | Class C | Class C |
Xiaomi 15 Ultra
- Exceptional battery endurance (58:58h)
- Ultra-fast charging speeds (90W wired, 80W wireless)
- Versatile reverse wireless charging (10W)
- Display brightness not specified, potentially lower than Samsung
- Camera specs unknown, making a direct comparison difficult
Samsung Galaxy S25 Ultra
- High peak display brightness (1417 nits)
- Qi2 wireless charging support
- Potentially longer battery lifespan (2000 cycles)
- Significantly lower battery endurance (44:54h)
- Slower charging speeds (45W wired, 15W wireless)
Display Comparison
The Samsung Galaxy S25 Ultra boasts a measured peak brightness of 1417 nits, a substantial advantage for outdoor visibility compared to the Xiaomi 15 Ultra (brightness data not provided). While the Xiaomi 15 Ultra’s panel technology isn’t specified, Samsung’s likely implementation of LTPO technology allows for dynamic refresh rate scaling, potentially improving efficiency. However, the practical benefit of the higher brightness is diminished for indoor users, and the lack of detailed Xiaomi display specs makes a definitive judgment difficult.
Camera Comparison
Camera specifications are not provided beyond the device names. However, given Samsung’s history, the S25 Ultra likely features a versatile multi-camera system with a focus on high-resolution sensors and advanced image processing. Xiaomi has been increasingly competitive in camera performance, and the 15 Ultra likely offers a compelling alternative. Without detailed sensor size, aperture, and OIS information, a direct comparison is impossible, but we can expect both to deliver flagship-level image quality.
Performance
Both devices are powered by the Qualcomm SM8750-AC/AB Snapdragon 8 Elite (3nm) featuring an octa-core CPU configuration with 2x Oryon V2 Phoenix L cores at 4.32/4.47 GHz and 6x Oryon V2 Phoenix M cores at 3.53 GHz. The S25 Ultra’s slightly higher clock speed on the prime cores suggests a marginal performance advantage in single-threaded tasks, but real-world differences will likely be minimal. Both utilize LPDDR5x RAM (spec not provided, but standard for this class), and thermal management will be crucial to sustaining peak performance; the 3nm process should aid in this regard.
Battery Life
The Xiaomi 15 Ultra’s 58:58h endurance rating significantly surpasses the Samsung Galaxy S25 Ultra’s 44:54h. This difference is further amplified by the charging speeds: 90W wired, 80W wireless, and 10W reverse wireless for the Xiaomi, versus 45W wired, 15W wireless (Qi2 Ready), and 4.5W reverse wireless for the Samsung. The Xiaomi 15 Ultra can achieve a full charge much faster, and its wireless charging is nearly six times quicker. The S25 Ultra’s 2000 battery cycles suggest improved longevity, but the initial endurance advantage of the Xiaomi is substantial.
Buying Guide
Buy the Xiaomi 15 Ultra if you need all-day battery life and the fastest possible charging speeds, minimizing downtime. This phone is ideal for travelers, content creators, and anyone who heavily uses their smartphone throughout the day. Buy the Samsung Galaxy S25 Ultra if you prioritize a brighter display for outdoor visibility and are willing to trade some battery endurance for that feature. It’s a strong choice for media consumption and photography in bright sunlight.