The sub-$150 smartphone market is fiercely competitive. The Oscal Flat 2C prioritizes longevity with a focus on battery endurance, while the Realme C51s aims for a more responsive experience with faster charging. This comparison dissects their core components to determine which device best suits your needs.
🏆 Quick Verdict
For most users, the Realme C51s is the better choice. Its Unisoc Tiger T612 chipset offers a noticeable performance uplift over the Oscal Flat 2C’s T603, and the 33W charging dramatically reduces downtime. While the Oscal boasts impressive battery endurance, the Realme’s speed advantage is more impactful for daily use.
| Network |
|---|
| 2G bands | GSM 850 / 900 / 1800 / 1900 | GSM 850 / 900 / 1800 / 1900 |
| 3G bands | HSDPA 900 / 2100 | HSDPA 900 / 2100 |
| 4G bands | 1, 3, 7, 8, 19, 20, 38, 40, 41 | 1, 3, 5, 8, 38, 40 |
| Speed | HSPA, LTE | HSPA, LTE |
| Technology | GSM / HSPA / LTE | GSM / HSPA / LTE |
| Launch |
|---|
| Announced | 2025, January | 2024, March 15 |
| Status | Available. Released 2025, January | Available. Released 2024, March 15 |
| Body |
|---|
| Build | - | Glass front, plastic frame, plastic back |
| Dimensions | 163.2 x 75.2 x 8.8 mm (6.43 x 2.96 x 0.35 in) | 167.2 x 76.7 x 7.5 mm (6.58 x 3.02 x 0.30 in) |
| SIM | Nano-SIM + Nano-SIM | Nano-SIM + Nano-SIM |
| Weight | 193 g (6.81 oz) | 182 g (6.42 oz) |
| Display |
|---|
| Protection | Mohs level 5 | - |
| Resolution | 720 x 1612 pixels, 20:9 ratio (~269 ppi density) | 720 x 1600 pixels, 20:9 ratio (~260 ppi density) |
| Size | 6.56 inches, 103.4 cm2 (~84.2% screen-to-body ratio) | 6.74 inches, 109.7 cm2 (~85.5% screen-to-body ratio) |
| Type | IPS LCD, 450 nits | IPS LCD, 90Hz, 560 nits (peak) |
| Platform |
|---|
| CPU | Octa-core 8x1.6 GHz Cortex-A55 | Octa-core (2x1.8 GHz Cortex-A75 & 6x1.8 GHz Cortex-A55) |
| Chipset | Unisoc T603 (22 nm) | Unisoc Tiger T612 (12 nm) |
| GPU | IMG8322 | Mali-G57 |
| OS | Android 14 (Go edition), DokeOS 4.0 | Android 13, Realme UI |
| Memory |
|---|
| Card slot | microSDXC (dedicated slot) | microSDXC (dedicated slot) |
| Internal | 64GB 2GB RAM | 128GB 6GB RAM |
| Main Camera |
|---|
| Features | LED flash, HDR, panorama | LED flash, HDR, panorama |
| Single | 13 MP, (wide), 1/4.0", 1.12 μm | 50 MP, f/1.8, 27mm (wide), 1/2.76", 0.64µm, PDAF
Auxiliary lens |
| Video | 1080p@30fps | 1080p@30fps |
| Selfie camera |
|---|
| Features | - | HDR |
| Single | 8 MP, (wide) | 5 MP, f/2.2, 28mm (wide), 1/5.0", 1.12µm |
| Video | 1080p@30fps | 720p@30fps |
| Sound |
|---|
| 35mm jack | Yes | Yes |
| Loudspeaker | Yes | Yes |
| Comms |
|---|
| Bluetooth | 4.2, A2DP | 5.0, A2DP, LE |
| NFC | No | Yes, 360˚ (market/region dependent) |
| Positioning | GPS, GLONASS, GALILEO | GPS, GLONASS, GALILEO |
| Radio | FM radio | Unspecified |
| USB | USB Type-C, OTG | USB Type-C |
| WLAN | Wi-Fi 802.11 b/g/n | Wi-Fi 802.11 a/b/g/n/ac, dual-band |
| Features |
|---|
| Sensors | Accelerometer, proximity | Fingerprint (side-mounted), accelerometer, gyro, proximity, compass |
| Battery |
|---|
| Charging | 10W wired | 33W wired, 0-50% in 28 min |
| Type | 5000 mAh | 5000 mAh |
| Misc |
|---|
| Colors | Phantom Black, Ripple Blue, Sky Purple | Shiny Green, Mighty Black |
| Models | - | RMX3765 |
| Price | - | About 100 EUR |
| EU LABEL |
|---|
| Battery | 51:18h endurance, 1100 cycles | - |
| Energy | Class B | - |
| Free fall | Class C (90 falls) | - |
| Repairability | Class B | - |
Oscal Flat 2C
- Exceptional battery endurance (51:18h)
- Long-lasting battery health (1100 cycles)
- Potentially lower price point
- Slower processor (Unisoc T603)
- Slow 10W charging
- Less responsive user experience
Realme C51s
- Faster processor (Unisoc Tiger T612)
- Rapid 33W charging (0-50% in 28 min)
- Smoother multitasking and app launches
- Likely shorter battery life compared to Oscal
- Potentially higher price point
- May run slightly warmer under load
Display Comparison
Neither device specifies display details beyond size, leaving brightness and color accuracy as unknowns. However, the focus here is on internal components. The absence of high refresh rate panels is typical for this price bracket, meaning both phones will likely offer a standard 60Hz experience. Bezels are also likely to be substantial on both devices, given their budget positioning.
Camera Comparison
Without detailed camera specifications, a direct comparison is difficult. However, it’s safe to assume both phones feature basic camera setups geared towards casual photography. The focus should be on the primary sensor, as auxiliary lenses (often 2MP macro cameras) offer limited utility. The Realme C51s may benefit from slightly more advanced image processing capabilities inherent in the newer chipset, but substantial differences are unlikely.
Performance
The Realme C51s’ Unisoc Tiger T612, fabricated on a 12nm process, represents a significant architectural upgrade over the Oscal Flat 2C’s Unisoc T603 (22nm). The T612’s CPU configuration – featuring two Cortex-A75 cores clocked at 1.8GHz alongside six A55 cores – provides a substantial boost in single-core performance compared to the Flat 2C’s all-A55, 1.6GHz setup. This translates to snappier app launches and smoother multitasking. The 12nm process also contributes to improved power efficiency, mitigating some of the performance gains. While both phones likely share similar RAM configurations, the chipset difference is the defining factor.
Battery Life
The Oscal Flat 2C shines in battery endurance, boasting an impressive 51:18h rating. This suggests a large battery capacity and efficient power management. However, the Realme C51s compensates with its 33W wired charging, capable of reaching 50% charge in just 28 minutes. This drastically reduces downtime compared to the Oscal’s slow 10W charging. The Oscal’s 1100 charge cycles suggest a focus on long-term battery health, but the Realme’s faster charging offers a more convenient daily experience.
Buying Guide
Buy the Oscal Flat 2C if you absolutely prioritize battery life above all else and rarely engage in demanding tasks. Its 51:18h endurance is ideal for users who frequently travel or have limited access to power outlets. Buy the Realme C51s if you value a smoother, more responsive user experience, faster app loading times, and the convenience of rapid 33W charging – making it perfect for everyday users and casual gamers.
Frequently Asked Questions
❓ Is the Unisoc Tiger T612 in the Realme C51s powerful enough for casual gaming like PUBG Mobile?
Yes, the T612’s Cortex-A75 cores provide a noticeable performance boost over the T603. While it won’t deliver flagship-level graphics, it should handle PUBG Mobile at medium settings with acceptable frame rates. Expect some frame drops during intense firefights, but the experience should be playable.
❓ How much faster is the 33W charging on the Realme C51s compared to the 10W charging on the Oscal Flat 2C in real-world use?
The difference is substantial. The Realme C51s can reach 50% charge in approximately 28 minutes, while the Oscal Flat 2C will likely take over two hours to achieve the same level. This means you can quickly top up the Realme C51s during short breaks, whereas the Oscal requires a much longer charging period.
❓ Does the Oscal Flat 2C's 1100 charge cycle rating guarantee the battery will last significantly longer over time?
While 1100 cycles is a high number, it doesn't guarantee longevity. Battery degradation is affected by numerous factors, including charging habits, temperature, and usage patterns. However, it suggests Oscal has prioritized battery health and used components designed for extended lifespan.
