The Xiaomi Redmi 15 and Oppo A78 4G represent compelling options in the crowded budget smartphone market. While both aim to deliver a solid experience without breaking the bank, they take different approaches to achieving this goal. The Redmi 15 prioritizes long-term battery endurance and a newer chipset architecture, while the A78 4G focuses on blazing-fast charging speeds. This comparison will dissect their key differences to help you determine which device best suits your needs.
🏆 Quick Verdict
For the average user prioritizing sustained performance and longevity, the Xiaomi Redmi 15 emerges as the winner. Its Snapdragon 6s Gen 3 chipset, coupled with exceptional 67:03h battery endurance and 1000 charge cycles, offers a more balanced and future-proof experience than the Oppo A78 4G's focus on rapid charging.
| 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 / 2100 |
| 4G bands | 1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 26, 28, 32, 38, 40, 41, 42, 48, 66, 71 | LTE |
| 5G bands | 1, 2, 3, 5, 7, 8, 12, 20, 26, 28, 38, 40, 41, 48, 66, 77, 78, 71 SA/NSA | - |
| Speed | HSPA, LTE, 5G | HSPA, LTE |
| Technology | GSM / HSPA / LTE / 5G | GSM / HSPA / LTE |
| Launch |
|---|
| Announced | 2025, August 01 | 2023, July 10 |
| Status | Available. Released 2025, August 01 | Available. Released 2023, July 10 |
| Body |
|---|
| Build | Glass front (Gorilla Glass 3), plastic frame, plastic back | - |
| Dimensions | 169.5 x 80.5 x 8.4 mm (6.67 x 3.17 x 0.33 in) | 160 x 73.2 x 7.9 mm (6.30 x 2.88 x 0.31 in) |
| SIM | Nano-SIM + Nano-SIM | Nano-SIM + Nano-SIM |
| Weight | 217 g (7.65 oz) | 180 g (6.35 oz) |
| Display |
|---|
| Protection | Corning Gorilla Glass 3, Mohs level 6 | Corning Gorilla Glass 5 |
| Resolution | 1080 x 2340 pixels, 19.5:9 ratio (~374 ppi density) | 1080 x 2400 pixels, 20:9 ratio (~409 ppi density) |
| Size | 6.9 inches, 116.9 cm2 (~85.7% screen-to-body ratio) | 6.43 inches, 99.8 cm2 (~85.2% screen-to-body ratio) |
| Type | IPS LCD, 144Hz, 600 nits (typ), 700 nits (HBM), 850 nits (peak) | AMOLED, 90Hz, 430 nits |
| Platform |
|---|
| CPU | Octa-core (2x2.3 GHz Cortex-A78 & 6x2.0 GHz Cortex-A55) | Octa-core (4x2.4 GHz Kryo 265 Gold & 4x1.9 GHz Kryo 265 Silver) |
| Chipset | Qualcomm SM6375 Snapdragon 6s Gen 3 (6 nm) | Qualcomm SM6225 Snapdragon 680 4G (6 nm) |
| GPU | Adreno 619 | Adreno 610 |
| OS | Android 15, HyperOS 2.2 | Android 13, ColorOS 13.1 |
| Memory |
|---|
| Card slot | microSDXC (uses shared SIM slot) | microSDXC |
| Internal | 128GB 4GB RAM, 128GB 6GB RAM, 128GB 8GB RAM, 256GB 8GB RAM | 128GB 8GB RAM, 256GB 8GB RAM |
| Main Camera |
|---|
| Dual | 50 MP, f/1.8, (wide), 1/2.88" 0.61μm, PDAF
Auxiliary lens | 50 MP, f/1.8, (wide), PDAF
Auxiliary lens |
| Features | LED flash, HDR | LED flash, HDR, panorama |
| Video | 1080p@30fps | 1080p@30fps |
| Selfie camera |
|---|
| Features | HDR | - |
| Single | 8 MP, f/2.0, (wide) | 8 MP, f/2.0, (wide) |
| Video | 1080p@30fps | 1080p@30fps |
| Sound |
|---|
| 35mm jack | No | Yes |
| Loudspeaker | Yes | Yes, with stereo speakers |
| Comms |
|---|
| Bluetooth | 5.1, A2DP, LE, aptX | 5.0, A2DP, LE |
| Infrared port | Yes | - |
| NFC | Yes (market/region dependent) | Yes (market/region dependent) |
| Positioning | GPS, GLONASS, GALILEO, BDS | GPS, GALILEO, GLONASS, BDS |
| Radio | No | No |
| USB | USB Type-C 2.0, OTG | USB Type-C 2.0, OTG |
| WLAN | Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct | Wi-Fi 802.11 a/b/g/n/ac, dual-band |
| Features |
|---|
| Sensors | Fingerprint (side-mounted), accelerometer, compass | Fingerprint (under display, optical), accelerometer, gyro, proximity, compass |
| Battery |
|---|
| Charging | 33W wired, PD 2.0, PPS, QC3
18W reverse wired | 67W wired, PD, 76% in 30 min |
| Type | 7000 mAh | Li-Po 5000 mAh |
| Misc |
|---|
| Colors | Midnight Black, Titan Gray, Ripple Green | Mist Black, Aqua Green |
| Models | 25057RN09E | CPH2565 |
| Price | € 159.00 / $ 219.99 / £ 179.00 | About 200 EUR |
| SAR EU | 1.00 W/kg (head) 1.00 W/kg (body) | - |
| EU LABEL |
|---|
| Battery | 67:03h endurance, 1000 cycles | - |
| Energy | Class B | - |
| Free fall | Class D (45 falls) | - |
| Repairability | Class C | - |
Xiaomi Redmi 15
- Exceptional battery endurance (67:03h)
- Long battery lifespan (1000 charge cycles)
- More modern chipset architecture (Snapdragon 6s Gen 3)
- Slower charging speed compared to Oppo A78 4G
- Display specifications unknown
Oppo A78 4G
- Ultra-fast 67W charging (76% in 30 minutes)
- Potentially more vibrant display (based on brand reputation)
- Higher clock speeds on primary CPU cores
- Lower battery endurance compared to Redmi 15
- Older chipset architecture (Snapdragon 680)
Display Comparison
Display specifications are absent from the provided data, but considering the price bracket, both devices likely feature LCD panels with FHD+ resolution. The key differentiator will likely be peak brightness and color accuracy, areas where Oppo historically performs well. Without specific data, it's difficult to definitively declare a winner, but Oppo's brand reputation suggests a potentially more vibrant display experience.
Camera Comparison
Camera details are limited, but the absence of any mention of high-resolution sensors or advanced features suggests both phones will offer a basic camera experience. Without sensor size or aperture information, it's impossible to make a meaningful comparison. It's likely both devices rely on software processing to enhance image quality, and the resulting photos will be adequate for social media sharing but won't compete with higher-end smartphones. We can assume both will have a primary camera and potentially depth/macro sensors, but their quality is likely to be similar.
Performance
The core of the performance difference lies in the chipsets. The Xiaomi Redmi 15 utilizes the Qualcomm SM6375 Snapdragon 6s Gen 3 (6 nm), featuring an octa-core CPU with 2x2.3 GHz Cortex-A78 and 6x2.0 GHz Cortex-A55 cores. This architecture, built on a 6nm process, offers a performance edge over the Oppo A78 4G’s Snapdragon 680 4G (6 nm) with its 4x2.4 GHz Kryo 265 Gold & 4x1.9 GHz Kryo 265 Silver cores. While the A78 4G boasts higher clock speeds on its 'Gold' cores, the Cortex-A78 cores in the Redmi 15 are generally more efficient and deliver better sustained performance. This translates to smoother multitasking and a more responsive user experience, particularly for demanding applications. The 6nm process node is identical, suggesting similar thermal efficiency, but the architectural advantage favors the Redmi 15.
Battery Life
Battery life is a significant differentiator. The Xiaomi Redmi 15 boasts an impressive 67:03h endurance rating and a remarkable 1000 charge cycles, indicating exceptional longevity. This is coupled with 33W wired charging, supporting PD 2.0, PPS, and QC3 standards, plus 18W reverse wired charging. The Oppo A78 4G, while offering a faster 67W wired charging (reaching 76% in 30 minutes), lacks the Redmi 15’s endurance and cycle count. The faster charging is beneficial for users who frequently need to top up their battery quickly, but the Redmi 15’s superior endurance means fewer charging cycles overall, potentially extending the battery’s lifespan. The inclusion of PD, PPS, and QC3 on the Redmi 15 also provides broader compatibility with various chargers.
Buying Guide
Buy the Xiaomi Redmi 15 if you need a phone that will reliably last throughout the day and beyond, and if you value a more modern chipset architecture for smoother multitasking and app performance. Buy the Oppo A78 4G if you prioritize minimizing downtime and need the fastest possible charging speeds, even if it means potentially sacrificing some long-term battery health and sustained performance.
Frequently Asked Questions
❓ Will the Snapdragon 680 in the Oppo A78 4G struggle with graphically intensive games like PUBG Mobile?
The Snapdragon 680 is capable of running PUBG Mobile, but you'll likely need to lower the graphics settings to achieve a consistently smooth frame rate. The Redmi 15's Snapdragon 6s Gen 3, with its more efficient Cortex-A78 cores, will offer a slightly better gaming experience, allowing for higher settings without significant frame drops.
❓ How does the 67W charging on the Oppo A78 4G compare to the 33W charging on the Redmi 15 in real-world usage?
The Oppo A78 4G can charge from 0 to 76% in just 30 minutes, a significant advantage for users who need a quick power boost. The Redmi 15's 33W charging will take considerably longer to reach a full charge, but its exceptional battery endurance means you'll likely need to charge it less frequently.
❓ Is the 18W reverse wired charging on the Redmi 15 useful for charging accessories like earbuds?
Yes, the 18W reverse wired charging is a convenient feature for topping up accessories like wireless earbuds or smartwatches. While not as fast as dedicated chargers, it's a handy option when you're on the go and don't have access to a power outlet.
