Available Variants
Full Specifications
Network
| Technology | GSM / HSPA / LTE |
| 2G bands | GSM 850 / 900 / 1800 / 1900 |
| 3G bands | HSDPA 900 / 2100 |
| Speed | HSPA, LTE |
| 4G bands | 1, 3, 5, 8, 40 |
Launch
| Announced | 2026, May 07 |
| Status | Available. Released 2026, May 15 |
Body
| SIM | Nano-SIM + Nano-SIM |
| Build | Glass front, plastic frame, plastic back |
| Weight | 219 g (7.72 oz) |
| Dimensions | 166.5 x 78.2 x 8.6 mm (6.56 x 3.08 x 0.34 in) |
Display
| Size | 6.8 inches, 113.0 cm2 (~86.8% screen-to-body ratio) |
| Resolution | 720 x 1570 pixels, 19.5:9 ratio (~254 ppi density) |
| Protection | ArmorShell glass or Panda Glass, Mohs level 5 |
| Type | IPS LCD, 120Hz, 900 nits (HBM) |
Hardware & Software
| OS | Android 16 |
| Chipset | Unisoc T7250 (12 nm) |
| CPU | Octa-core (2x1.8 GHz Cortex-A75 & 6x1.6 GHz Cortex-A55) |
| GPU | Mali-G57 MP1 |
Memory & Storage
| Card slot | microSDXC |
| Internal | 64GB 4GB RAM, 128GB 4GB RAM, 128GB 6GB RAM, 256GB 4GB RAM, 256GB 6GB RAM |
Main Camera
| Video | 1080p@30fps |
| Features | LED flash, HDR, panorama |
| Dual | 50 MP, f/1.8, (wide), PDAF Auxiliary lens |
Selfie Camera
| Single | 5 MP, f/2.2, (wide) |
| Video | 720p@30fps |
Sound
| Loudspeaker | Yes |
| 3.5mm jack | Yes |
Connectivity
| WLAN | Wi-Fi 802.11 a/b/g/n/ac, dual-band |
| USB | USB Type-C 2.0, OTG |
| NFC | Yes (market/region dependent) |
| Positioning | GPS, GALILEO, GLONASS, BDS |
| Bluetooth | 5.2, A2DP, LE |
Features
| Sensors | Fingerprint (side-mounted), accelerometer, proximity, compass |
Battery
| Charging | 45W wired, 45W PPS, 13.5W PD Reverse wired |
| Type | Si/C Li-Ion 8000 mAh or 7500 mAh |
Misc
| Colors | Golden Coast, Deepblue Tides |
| Models | RMX5366 |
| Energy | Class A |
| EU Label | Battery 90:46h endurance, 1600 cycles, Free fall Class B (240 falls), Repairability Class C |
Tests
| Repairability | Class C |
| Free fall | Class B (240 falls) |
| Battery | 90:46h endurance, 1600 cycles |
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Description
Overview & Display
The Realme C100x arrives with a sturdy, practical build — glass front paired with a plastic frame and back — that feels solid if a touch chunky at 219 grams. The 6.8-inch IPS LCD takes center stage, offering a fluid 120Hz refresh rate and a peak brightness of 900 nits, which makes scrolling feel smooth and keeps outdoor visibility surprisingly strong. The display is protected by ArmorShell or Panda Glass rated at Mohs level 5, and the screen-to-body ratio of about 86.8% keeps bezels reasonably slim. The 720 x 1570 resolution results in a modest pixel density, but for everyday streaming, browsing, and social media consumption, it holds up well. It also carries a Class B free-fall rating for impact resistance, which adds peace of mind.
Under the hood, the Unisoc T7250 chipset built on a 12nm process teams up with up to 6GB of RAM. The octa-core CPU — two Cortex-A75 performance cores and six Cortex-A55 efficiency cores — handles daily routines with reasonable composure. Android 16 runs the software side, and storage options span from 64GB to 256GB, backed by a microSDXC slot for added room. Multitasking across messaging, light gaming, and video playback feels smooth enough for the intended audience, though heavy workloads will quickly reveal the limits of this entry-level silicon.
Camera & Battery
The dual-camera arrangement on the Realme C100x is led by a 50MP wide sensor with an f/1.8 aperture and PDAF, accompanied by an auxiliary lens. The camera interface includes LED flash, HDR, and panorama modes, covering the essentials for casual photography. In well-lit conditions, the 50MP sensor should deliver crisp, well-detailed shots. Video recording tops out at 1080p at 30 frames per second, which is standard at this level. Up front, the 5MP selfie camera with an f/2.2 lens handles social media selfies and video calls, though it's limited to 720p video capture.
Battery life is where this device truly stands out. The Realme C100x packs a silicon-carbon cell rated at 8000mAh or 7500mAh depending on the variant, yielding a remarkable endurance rating of over 90 hours. That translates to two full days of heavy use — or three-plus days of moderate usage — between charges. When it's time to refill, the 45W wired charging with PPS support and 13.5W PD gets the battery back to a usable level in good time. Reverse wired charging is also available, letting you use the phone as a power bank for earbuds or a friend's device. The battery is rated for 1600 charge cycles, which bodes well for long-term longevity.
Who Should Buy This
The Realme C100x is built for users who prioritize endurance above all else. If you're constantly on the move, work long shifts, or simply dislike carrying chargers, this phone's multi-day battery life is a genuine game-changer. It's also a smart pick for first-time smartphone buyers, students, or anyone seeking a dependable backup device. The 120Hz display and expandable storage make it appealing for media consumers on a tight budget. However, if you need heavy gaming performance, a sharper screen, or a more versatile camera system, you'll likely want to explore other options. The C100x nails the fundamentals — battery, durability, and everyday usability — without pretending to be anything more.
Pros
- Massive 7500-8000mAh battery with 90-hour endurance
- Smooth 120Hz IPS display with 900 nits brightness
- Expandable storage up to 256GB via microSDXC
- Fast 45W charging with reverse wired support
- Side-mounted fingerprint sensor for quick access
Cons
- 720p resolution yields low pixel density
- Basic 5MP selfie camera limited to 720p
- Entry-level chipset struggles with heavy gaming
- Heavy 219g body may feel bulky
Verdict
The Realme C100x is a purpose-driven smartphone that puts battery life front and center. With a 90-hour endurance rating, 45W fast charging, and reverse wired power delivery, it's a reliable companion for anyone who hates being tethered to an outlet. The 120Hz display adds a surprisingly smooth touch, and expandable storage is always welcome. Its limitations — modest resolution, entry-level performance, and a basic selfie camera — are clear, but they're acceptable given the phone's focus. If your priority is a dependable, long-lasting daily driver, the C100x delivers. It's practical, sturdy, and unapologetically budget-focused.
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