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Xiaomi Redmi S2 Smartphone Review

Mike Wobker, 👁 Florian Schmitt, Tanja Hinum (translated by Ariana Brodsky), 07/16/2018

"S" stands for selfie. Xiaomi's Redmi S2 heralds the arrival of a series of smartphones with high-quality front cameras—designed with selfie-lovers in mind. Incidentally, it is also one of the Chinese manufacturer's most inexpensive devices equipped with a dual camera. What else does the Xiaomi Redmi S2 have in store for potential buyers? Read on to find out.

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Xiaomi Redmi S2

Now that Xiaomi has established itself in the European market, customers on this continent (+North America) have access to the company's sometimes cheap, sometimes powerful smartphones, or, occasionally, both at once. The smartphones in Xiaomi's Redmi series count among the manufacturer's cheaper models, though the configuration options for these devices range from the simple to the more high-caliber.

Our test device is Xiaomi's latest release, and its hardware configuration is primarily tailored to selfie-lovers. The 16 MP front camera purportedly takes good photos in any circumstance. With its 12+5 MP sensor, the main camera has no need to hide in the shadows either. The performance power necessary to run the Android Oreo system is provided by a Qualcomm Snapdragon 625 SoC and an Adreno 506 graphics unit. The CPU and GPU are joined by 4 GB of RAM and 32 GB of internal eMMC flash storage.

The Xiaomi Redmi S2 mid-range smartphone is currently available for a price of around 230 Euros (~$270; ~$220 in the US), landing it in a highly competitive price bracket. For our review, we will concentrate on comparable devices that offer a similar level of performance for a similar price. This includes Huawei's Y7 (2018), the Moto G6 Plus by Motorola, Samsung's Galaxy A6 and the Nokia 6 (2018), among others.

Xiaomi Redmi S2 (Redmi Series)
Graphics adapter
Memory
4096 MB 
Display
5.99 inch 18:9, 1440 x 720 pixel 269 PPI, capacitive, IPS, glossy: yes
Storage
32 GB eMMC Flash, 32 GB 
, also available with 64 GB of eMMC flash storage, 24 GB free
Connections
1 USB 2.0, 1 Infrared, Audio Connections: 3.5mm, Card Reader: microSD, 1 Fingerprint Reader, Brightness Sensor, Sensors: proximity sensor, acceleration sensor, gyroscope, compass, Hall effect sensor
Networking
802.11 b/g/n (b/g/n), Bluetooth 4.2, GSM (800, 850, 900, 1800, 1900), 3G (850, 900, 1900, 2100), LTE (800, 850, 900, 1700, 1800, 2100, 2300, 2600), Dual SIM, LTE, GPS
Size
height x width x depth (in mm): 8.1 x 160.7 x 77.3 ( = 0.32 x 6.33 x 3.04 in)
Battery
3080 mAh Lithium-Polymer
Operating System
Android 8.1 Oreo
Camera
Primary Camera: 12 MPix 12+5MP
Secondary Camera: 16 MPix
Additional features
Speakers: 2 speakers, Keyboard: onscreen, Keyboard Light: yes, USB charger, microUSB cable, protective silicone cover, MIUI V9, 24 Months Warranty, SAR-value (head): 0.429 W/kg, SAR-value (body): 1.577 W/kg, fanless
Weight
170 g ( = 6 oz / 0.37 pounds), Power Supply: 55 g ( = 1.94 oz / 0.12 pounds)
Note: The manufacturer may use components from different suppliers including display panels, drives or memory sticks with similar specifications.

 

Case - Stable smartphone with a metal case

Xiaomi has opted to house the Redmi S2 in a metal case, available in gold or gray. It feels as if the display has been laid on top, as it protrudes from the smartphone's border by about a millimeter. Despite the rounded corners, the sides feel a little blocky. The manufacturing quality is solid,nothing to criticize here. All transitions between elements are even, and the buttons sit firmly in place.

Compared to the competition, the S2 is somewhat heavier than other 6-inch devices, although this can be traced back to the stable metal case. All other measurements are normal for smartphones of this size. On the back, the dual camera protrudes significantly from the case. Because the camera is located on the top left side, the user can feel around for the fingerprint sensor without smearing the lenses.

Xiaomi Redmi S2
Xiaomi Redmi S2
Xiaomi Redmi S2
Xiaomi Redmi S2
Xiaomi Redmi S2
Xiaomi Redmi S2
Xiaomi Redmi S2
Xiaomi Redmi S2
Xiaomi Redmi S2
Xiaomi Redmi S2
Xiaomi Redmi S2

Size Comparison

Connectivity - Xiaomi smartphone with infrared sensor

The Xiaomi Redmi S2 is equipped with Qualcomm's Snapdragon 625, an Adreno 506 graphics unit, 4 GB of RAM and 32 GB of internal storage. Users can expand the storage via a microSD card slot that can house the memory card and two nanoSIM cards simultaneously.

The microUSB port serves to charge the device and connects it with other accessories. In addition, users have access to a 3.5mm jack that enables the Xiaomi smartphone to be physically connected to a headset or external speakers.

The infrared sensor is somewhat of a special feature. Using the "Mi Remote" app, the smartphone can act as a remote control for TVs, sound systems or DVD players.

Left side: SIM/microSD card slot
Left side: SIM/microSD card slot
Top side: 3.5mm jack, infrared sensor, microphone
Top side: 3.5mm jack, infrared sensor, microphone
Right side: volume rocker, power button
Right side: volume rocker, power button
Bottom side: speakers, microUSB connection
Bottom side: speakers, microUSB connection

Software - Xiaomi Redmi S2 with MIUI Global 9.5

The Redmi S2 comes with Android Oreo version 8.1, inclusive of security updates dated from March 5th, 2018. Xiaomi has chosen to employ the company's own user interface: the MIUI Global 9.5. Alongside customized symbols, this UI also comes with its own phone and texting apps. The settings menu is also structured differently than on an Android system. The UI has a customized start screen on which users can choose to store a hodgepodge of app shortcuts and information of all kinds, although the standard Android start screen is also available for those who prefer it.

Aside from a Facebook app, there are no programs from third-parties on our test device. On the other hand, various Xiaomi tools (such as a compass app) come pre-installed and can only be deleted through the software menu. But the number of pre-installed apps is reasonable, and they provide useful functions. A microSD card only enlarges the storage space available for the user's own data; apps cannot be installed on it, and it is not possible to reformat it as internal storage. Buyers of this smartphone will also have to forgo the possibility of setting up multiple user accounts.

Software Xiaomi Redmi S2
Software Xiaomi Redmi S2
Software Xiaomi Redmi S2
Software Xiaomi Redmi S2
Software Xiaomi Redmi S2
Software Xiaomi Redmi S2

Communication and GPS - Redmi smartphone with worldwide LTE

The Xiaomi Redmi S2 has GSM, 3G and LTE at its command. The global version, available in Europe and the US, is equipped with LTE Cat. 9, meaning that the device can be used worldwide. Download rates reach up to 450 MBit/s; upload rates up to 50 MBit/s. Special versions for China and India are limited to the frequency bands common in those countries.

In our tests, the wireless reception was always good, and even in areas with poor network coverage, we had the sense that it maintained the connection longer than other devices. Users can rely on Bluetooth 4.2 and WLAN for communication over shorter distances. The latter only supports the standards b, g and n. With these limited options, the transfer rates in our tests were correspondingly low. The send and receive rates oscillated in the 50 MBit/s range, landing the Redmi S2 in last place among our list of devices for comparison.

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Networking
iperf3 Client (receive) TCP 1 m 4M x10
Motorola Moto G6 Plus
Adreno 508, 630, 64 GB eMMC Flash
310 MBit/s ∼100% +553%
Nokia 6 2018
Adreno 508, 630, 32 GB eMMC Flash
289 MBit/s ∼93% +508%
Average of class Smartphone
  (5.9 - 939, n=298)
206 MBit/s ∼66% +334%
Samsung Galaxy A6 2018
Mali-T830 MP2, 7870 Octa, 32 GB eMMC Flash
120 MBit/s ∼39% +153%
Huawei Y7 2018
Adreno 505, 430, 16 GB eMMC Flash
55 MBit/s ∼18% +16%
Xiaomi Redmi S2
Adreno 506, 625, 32 GB eMMC Flash
47.5 MBit/s ∼15%
iperf3 Client (transmit) TCP 1 m 4M x10
Nokia 6 2018
Adreno 508, 630, 32 GB eMMC Flash
345 MBit/s ∼100% +589%
Motorola Moto G6 Plus
Adreno 508, 630, 64 GB eMMC Flash
311 MBit/s ∼90% +521%
Average of class Smartphone
  (9.4 - 703, n=298)
201 MBit/s ∼58% +301%
Samsung Galaxy A6 2018
Mali-T830 MP2, 7870 Octa, 32 GB eMMC Flash
123 MBit/s ∼36% +146%
Huawei Y7 2018
Adreno 505, 430, 16 GB eMMC Flash
56.9 MBit/s ∼16% +14%
Xiaomi Redmi S2
Adreno 506, 625, 32 GB eMMC Flash
50.1 MBit/s ∼15%
GPS Test outdoors
GPS Test outdoors
GPS Test indoors
GPS Test indoors

We used the GPS Test app to determine how accurately the Xiaomi Redmi S2 could position us. In our tests, the built-in localization technologies enabled the smartphone to ascertain its position with an accuracy of up to 4 meters (~1ft)  outdoors. Afterwards, the satellite connection remained stable in a closed room as well, allowing the user access to location services indoors, although the accuracy dropped to 11 meters (~40 feet).

On our compulsory bike ride, time and again, the GPS's imprecision caused the Xiaomi smartphone to record our location on the wrong side of the street or to clip curves. As a result, the Xiaomi Redmi S2 appears to be suited for simple navigation tasks. In instances where the user needs a high level of positioning accuracy, an external device is preferable.

Xiaomi Redmi S2
Xiaomi Redmi S2
Xiaomi Redmi S2
Xiaomi Redmi S2
Xiaomi Redmi S2
Xiaomi Redmi S2
Garmin Edge 520
Garmin Edge 520
Garmin Edge 520
Garmin Edge 520
Garmin Edge 520
Garmin Edge 520

Phone Function and Call Quality - Smartphone by Xiaomi with good call quality

For phone conversations, users of Xiaomi's Redmi S2 have access to the manufacturer's own telephone app. This app is similar to the standard Android app, although it lacks a Places tab. The number pad also enables the user to input letters, as was common on earlier cellphone models. This means that the telephone tab is not accompanied by a keyboard, only the number pad is available here. In the Contacts window, on the other hand, the keyboard stands at the ready. Users can search through their contact list as usual. Neither VoLTE nor VoWLAN is available in our test device's settings.

During conversations, the Redmi smartphone proves to be sufficiently loud to drown out background noise. The noise cancellation also enables the person on the other end to enjoy a phone call free of background interference. The sound quality is good on both sides, and we did not experience any crackling or buzzing emanating from our test device's earphone. Users can talk on the Xiaomi smartphone hands-free using the built-in speakerphone. The volume is a little louder than on the earphone, and speech is reproduced well. At maximum volume however, voices buzz somewhat.

Cameras - Xiaomi Redmi S2 selfie smartphone

front camera
front camera

Xiaomi has equipped the Redmi S2 with a 12+5 MP dual camera and a front camera with a 16 MP sensor for selfie-lovers. The latter takes good photos in normal daylight conditions indoors. The camera focuses on the center of the image and captures details very well. A subtle soft focus also smooths surfaces. Objects in the background, on the other hand, are somewhat blurry. An optional function automatically determines the gender and age of the person being photographed. The smartphone's estimate of this author's age was quite accurate; another test subject was categorized five years younger.

In good lighting, the Xiaomi Redmi S2's main camera also takes good shots that contain lots of detail and well-defined light and dark areas. On the edges however, things get a little bit blurry. This effect shows up in close-ups as well and even more prominently. The differences in brightness are also substantially more visible, which in turn means that the contrast within dark areas is a little too low. In poor lighting conditions, photos are light enough for objects to be recognizable, but not captured sharply. The camera app offers various filters and modes for different kinds of photos, although the manual settings options are limited to white balance and ISO. The video recording function has similar limitations, but the good image stabilizer enables the smartphone to record jitter-free videos.

Image Comparison

Choose a scene and navigate within the first image. One click changes the position on touchscreens. One click on the zoomed-in image opens the original in a new window. The first image shows the scaled photograph of the test device.

Scene 1Scene 2Scene 3
click to load images
ColorChecker - Passport
ColorChecker - Passport

We used the ColorChecker Passport program to test the color accuracy of the Xiaomi Redmi S2's camera. The test revealed mixed results. While most colors are reproduced too darkly, yellow and green tones look a little too light. The grayscale and blacks are also too dark.

In a controlled lighting environment, the Redmi S2's camera performance is good. Fine structures and details are easily recognizable and sharp, even around the image border. Colors on the other hand, do not look particularly bold, and overall the photo is a little too dark.

Xiaomi Redmi S2  - test chart
Xiaomi Redmi S2  - test chart (detail)

Accessories and Warranty - Protective silicone cover for the Xiaomi Redmi S2

Xiaomi Redmi S2 - box contents
Xiaomi Redmi S2 - box contents

The Redmi S2's box contents include a USB power supply with matching microUSB cable, a SIM ejector tool, and a protective cover made of silicone. Additional accessories can be purchased on the manufacturer's website (among other places). The online catalog is not limited to accessories customized for our test device. Xiaomi's site also sells anything that can be connected to the smartphone; smart watches, external speakers and much more.

Buyers of the Xiaomi Redmi S2 will receive a 24-month warranty in the EU. 

Input Devices and Operation - Redmi S2 with Google keyboard

For text input, users of the Xiaomi Redmi S2 have access to Google's standard keyboard app, GBoard. This keyboard enables users to type texts quickly and easily. While typing, the touchscreen reacts somewhat slowly—but reliably nevertheless. Swiping on the other hand, is often not recognized or only generates a reaction after a short delay. The position sensor experiences a similar lag. If the user turns the device, it takes a moment before the image content turns in the corresponding direction.

Xiaomi Redmi S2 - keyboard
Xiaomi Redmi S2 - keyboard

Display - 6-inch smartphone from Xiaomi

subpixels
subpixels

The Xiaomi Redmi S2's display consists of a 6-inch IPS panel with a resolution of 1440x720 pixels in 18:9 format. Compared to other devices in this price bracket, the resolution is acceptable. With an average brightness level of 483 cd/m², our test device lands a good spot in the middle range between the rest of the devices on our comparison list.

460
cd/m²
491
cd/m²
498
cd/m²
459
cd/m²
501
cd/m²
509
cd/m²
456
cd/m²
495
cd/m²
482
cd/m²
Distribution of brightness
X-Rite i1Pro 2
Maximum: 509 cd/m² Average: 483.4 cd/m² Minimum: 1.24 cd/m²
Brightness Distribution: 90 %
Contrast: 771:1 (Black: 0.65 cd/m²)
ΔE Color 5.74 | 0.4-29.43 Ø6.3
ΔE Greyscale 5.3 | 0.64-98 Ø6.5
94.7% sRGB (Calman 2D)
Gamma: 2.309
Xiaomi Redmi S2
IPS, 1440x720, 5.99
Huawei Y7 2018
IPS, 1440x720, 5.99
Motorola Moto G6 Plus
IPS, 2160x1080, 5.9
Nokia 6 2018
IPS, 1920x1080, 5.5
Samsung Galaxy A6 2018
Super AMOLED, 1480x720, 5.6
Screen
13%
38%
-14%
18%
Brightness middle
501
393
-22%
761
52%
417
-17%
453
-10%
Brightness
483
365
-24%
723
50%
421
-13%
459
-5%
Brightness Distribution
90
85
-6%
90
0%
88
-2%
93
3%
Black Level *
0.65
0.29
55%
0.69
-6%
0.61
6%
Contrast
771
1355
76%
1103
43%
684
-11%
Colorchecker DeltaE2000 *
5.74
5.28
8%
2.4
58%
6.1
-6%
2.6
55%
Colorchecker DeltaE2000 max. *
8.53
9
-6%
5.2
39%
11.2
-31%
9.2
-8%
Greyscale DeltaE2000 *
5.3
4.2
21%
1.8
66%
7.1
-34%
1.6
70%
Gamma
2.309 95%
2.6 85%
2.21 100%
2.16 102%
2.07 106%
CCT
7895 82%
7086 92%
6312 103%
8362 78%
6356 102%

* ... smaller is better

Screen Flickering / PWM (Pulse-Width Modulation)

To dim the screen, some notebooks will simply cycle the backlight on and off in rapid succession - a method called Pulse Width Modulation (PWM) . This cycling frequency should ideally be undetectable to the human eye. If said frequency is too low, users with sensitive eyes may experience strain or headaches or even notice the flickering altogether.
Screen flickering / PWM not detected

In comparison: 52 % of all tested devices do not use PWM to dim the display. If PWM was detected, an average of 8781 (minimum: 43 - maximum: 142900) Hz was measured.

Further measurements of the Redmi S2's display reveal a mediocre contrast ratio of 771:1 and a black value of 0.65. In practical use, these results come to expression as colors that are not particularly clearly distinguished from each other, and a faint gray cast that overlays the entire image. Black tones also look somewhat pale.

In terms of screen content display, users of the Xiaomi smartphone can choose between various color profiles. The standard mode is proportionally higher in blue tones, while red tones are a little underrepresented. In the "Warm" color profile, the primary colors are somewhat more balanced and the blue tones significantly reduced. The proportion of red tones is increased by a small margin, leaving the image with an overall warmer feel.

CalMAN - color accuracy
CalMAN - color accuracy
CalMAN - color space
CalMAN - color space
CalMAN - gray scale
CalMAN - gray scale
CalMAN - saturation
CalMAN - saturation
CalMAN - color accuracy (warm)
CalMAN - color accuracy (warm)
CalMAN - color space (warm)
CalMAN - color space (warm)
CalMAN - grayscale (warm)
CalMAN - grayscale (warm)
CalMAN - saturation (warm)
CalMAN - saturation (warm)

Display Response Times

Display response times show how fast the screen is able to change from one color to the next. Slow response times can lead to afterimages and can cause moving objects to appear blurry (ghosting). Gamers of fast-paced 3D titles should pay special attention to fast response times.
       Response Time Black to White
16 ms ... rise ↗ and fall ↘ combined↗ 7 ms rise
↘ 9 ms fall
The screen shows good response rates in our tests, but may be too slow for competitive gamers.
In comparison, all tested devices range from 0.8 (minimum) to 240 (maximum) ms. » 13 % of all devices are better.
This means that the measured response time is better than the average of all tested devices (25.6 ms).
       Response Time 50% Grey to 80% Grey
35 ms ... rise ↗ and fall ↘ combined↗ 20 ms rise
↘ 15 ms fall
The screen shows slow response rates in our tests and will be unsatisfactory for gamers.
In comparison, all tested devices range from 0.9 (minimum) to 636 (maximum) ms. » 25 % of all devices are better.
This means that the measured response time is better than the average of all tested devices (41 ms).

Outdoors, the Xiaomi Redmi S2 can be used without any problems. Of course, shady spots are always preferable, given that the brightness is not intense enough to overcome reflections from the surrounding environment. The screen content is still visible despite reflections and direct sunlight, but it is considerably more difficult than in more moderate lighting conditions.

Xiaomi Redmi S2 in outdoor use
Xiaomi Redmi S2 in outdoor use
Xiaomi Redmi S2 in outdoor use
Xiaomi Redmi S2 in outdoor use

The Xiaomi Redmi S2's IPS panel has extremely stable viewing angles. From every angle imaginable, the display content on our test device is clearly visible. As long as there are no reflections from the surrounding environment obscuring the display, the user always has a clear view of the smartphone's screen content, even from less than ideal vantage points.

Xiaomi Redmi S2 - viewing angle stability
Xiaomi Redmi S2 - viewing angle stability

Performance - Good system performance on the Redmi S2

Xiaomi has chosen to equip the Redmi S2 with Qualcomm's Snapdragon 625 SoC and an Adreno 506 graphics unit. The two processors are supported by 4 GB of RAM and 32 GB of eMMC flash storage. This hardware configuration is appropriate for a solid mid-range smartphone, and this or similar configurations can be found in other smartphones within this price bracket. The Snapdragon 625 was released in February 2016 and offers 8 cores at a clock speed of 2 GHz. The 14nm manufacturing process enables the chip to run with good energy efficiency, which in turn has a positive effect on the smartphone's battery life.

Compared to the other devices in our comparison list, the Redmi S2 secures a good spot in the middle range. The Xiaomi smartphone performs somewhat better or somewhat worse than we would have expected in some individual benchmarks, but overall, it fulfilled our expectations of a device with this hardware configuration.

AnTuTu v6 - Total Score
Average of class Smartphone (23275 - 254229, n=383)
75223 Points ∼100% +22%
Nokia 6 2018
72580 Points ∼96% +18%
Motorola Moto G6 Plus
71635 Points ∼95% +17%
Average Qualcomm Snapdragon 625 (59867 - 68348, n=17)
63396 Points ∼84% +3%
Xiaomi Redmi S2
61486 Points ∼82%
Samsung Galaxy A6 2018
46779 Points ∼62% -24%
Huawei Y7 2018
45687 Points ∼61% -26%
AnTuTu v7 - Total Score
Average of class Smartphone (17073 - 348178, n=163)
115424 Points ∼100%
Nokia 6 2018
90435 Points ∼78%
Motorola Moto G6 Plus
90347 Points ∼78%
Average Qualcomm Snapdragon 625 (65759 - 81789, n=7)
65501 Points ∼57%
Samsung Galaxy A6 2018
61794 Points ∼54%
Huawei Y7 2018
59421 Points ∼51%
Xiaomi Redmi S2
Points ∼0%
PCMark for Android
Work 2.0 performance score
Average Qualcomm Snapdragon 625 (4626 - 5558, n=14)
4894 Points ∼100% +2%
Motorola Moto G6 Plus
4875 Points ∼100% +1%
Xiaomi Redmi S2
4804 Points ∼98%
Nokia 6 2018
4719 Points ∼96% -2%
Average of class Smartphone (0 - 9868, n=247)
4493 Points ∼92% -6%
Huawei Y7 2018
3874 Points ∼79% -19%
Samsung Galaxy A6 2018
3809 Points ∼78% -21%
Work performance score
Average Qualcomm Snapdragon 625 (4596 - 7846, n=16)
5855 Points ∼100% +8%
Motorola Moto G6 Plus
5712 Points ∼98% +5%
Nokia 6 2018
5484 Points ∼94% +1%
Xiaomi Redmi S2
5444 Points ∼93%
Huawei Y7 2018
4918 Points ∼84% -10%
Average of class Smartphone (3681 - 13211, n=415)
4907 Points ∼84% -10%
Samsung Galaxy A6 2018
4878 Points ∼83% -10%
BaseMark OS II
Web
Xiaomi Redmi S2
958 Points ∼100%
Motorola Moto G6 Plus
925 Points ∼97% -3%
Nokia 6 2018
895 Points ∼93% -7%
Average Qualcomm Snapdragon 625 (649 - 958, n=17)
772 Points ∼81% -19%
Samsung Galaxy A6 2018
732 Points ∼76% -24%
Average of class Smartphone (7 - 1731, n=491)
691 Points ∼72% -28%
Huawei Y7 2018
673 Points ∼70% -30%
Graphics
Average of class Smartphone (18 - 15969, n=491)
1695 Points ∼100% +67%
Motorola Moto G6 Plus
1523 Points ∼90% +50%
Nokia 6 2018
1520 Points ∼90% +50%
Xiaomi Redmi S2
1016 Points ∼60%
Average Qualcomm Snapdragon 625 (968 - 1026, n=17)
1008 Points ∼59% -1%
Huawei Y7 2018
739 Points ∼44% -27%
Samsung Galaxy A6 2018
533 Points ∼31% -48%
Memory
Average of class Smartphone (21 - 6283, n=491)
1218 Points ∼100% +61%
Motorola Moto G6 Plus
1213 Points ∼100% +60%
Nokia 6 2018
1161 Points ∼95% +53%
Huawei Y7 2018
1144 Points ∼94% +51%
Samsung Galaxy A6 2018
1096 Points ∼90% +45%
Average Qualcomm Snapdragon 625 (584 - 1553, n=17)
1018 Points ∼84% +34%
Xiaomi Redmi S2
758 Points ∼62%
System
Motorola Moto G6 Plus
3249 Points ∼100% +13%
Nokia 6 2018
3237 Points ∼100% +12%
Xiaomi Redmi S2
2882 Points ∼89%
Average Qualcomm Snapdragon 625 (1960 - 3261, n=17)
2819 Points ∼87% -2%
Average of class Smartphone (369 - 12202, n=491)
2464 Points ∼76% -15%
Samsung Galaxy A6 2018
2201 Points ∼68% -24%
Huawei Y7 2018
1906 Points ∼59% -34%
Overall
Motorola Moto G6 Plus
1535 Points ∼100% +27%
Nokia 6 2018
1504 Points ∼98% +25%
Average of class Smartphone (150 - 6097, n=495)
1229 Points ∼80% +2%
Xiaomi Redmi S2
1208 Points ∼79%
Average Qualcomm Snapdragon 625 (1019 - 1362, n=17)
1206 Points ∼79% 0%
Huawei Y7 2018
1020 Points ∼66% -16%
Samsung Galaxy A6 2018
985 Points ∼64% -18%
Geekbench 4.1/4.2
Compute RenderScript Score
Average of class Smartphone (836 - 21070, n=188)
4393 Points ∼100% +28%
Motorola Moto G6 Plus
3763 Points ∼86% +9%
Nokia 6 2018
3690 Points ∼84% +7%
Xiaomi Redmi S2
3440 Points ∼78%
Average Qualcomm Snapdragon 625 (2628 - 3678, n=10)
3281 Points ∼75% -5%
Huawei Y7 2018
2133 Points ∼49% -38%
64 Bit Multi-Core Score
Xiaomi Redmi S2
4366 Points ∼100%
Average of class Smartphone (883 - 11598, n=238)
4242 Points ∼97% -3%
Average Qualcomm Snapdragon 625 (3148 - 4396, n=12)
4171 Points ∼96% -4%
Motorola Moto G6 Plus
4011 Points ∼92% -8%
Samsung Galaxy A6 2018
3741 Points ∼86% -14%
Huawei Y7 2018
2889 Points ∼66% -34%
Nokia 6 2018
883 Points ∼20% -80%
64 Bit Single-Core Score
Nokia 6 2018
4210 Points ∼100% +398%
Average of class Smartphone (394 - 4824, n=239)
1251 Points ∼30% +48%
Xiaomi Redmi S2
846 Points ∼20%
Motorola Moto G6 Plus
822 Points ∼20% -3%
Average Qualcomm Snapdragon 625 (841 - 881, n=13)
799 Points ∼19% -6%
Samsung Galaxy A6 2018
732 Points ∼17% -13%
Huawei Y7 2018
676 Points ∼16% -20%
3DMark
2560x1440 Sling Shot Extreme (ES 3.1) Physics
Xiaomi Redmi S2
2099 Points ∼100%
Average Qualcomm Snapdragon 625 (1636 - 2177, n=17)
1958 Points ∼93% -7%
Motorola Moto G6 Plus
1822 Points ∼87% -13%
Nokia 6 2018
1738 Points ∼83% -17%
Samsung Galaxy A6 2018
1709 Points ∼81% -19%
Average of class Smartphone (549 - 4183, n=344)
1627 Points ∼78% -22%
Huawei Y7 2018
1258 Points ∼60% -40%
2560x1440 Sling Shot Extreme (ES 3.1) Graphics
Average of class Smartphone (69 - 5241, n=344)
1166 Points ∼100% +197%
Motorola Moto G6 Plus
721 Points ∼62% +83%
Nokia 6 2018
707 Points ∼61% +80%
Xiaomi Redmi S2
393 Points ∼34%
Average Qualcomm Snapdragon 625 (372 - 397, n=17)
384 Points ∼33% -2%
Huawei Y7 2018
255 Points ∼22% -35%
Samsung Galaxy A6 2018
211 Points ∼18% -46%
2560x1440 Sling Shot Extreme (ES 3.1)
Average of class Smartphone (86 - 4734, n=352)
1115 Points ∼100% +132%
Motorola Moto G6 Plus
833 Points ∼75% +74%
Nokia 6 2018
814 Points ∼73% +70%
Xiaomi Redmi S2
480 Points ∼43%
Average Qualcomm Snapdragon 625 (452 - 484, n=17)
467 Points ∼42% -3%
Huawei Y7 2018
310 Points ∼28% -35%
Samsung Galaxy A6 2018
262 Points ∼23% -45%
2560x1440 Sling Shot OpenGL ES 3.0 Physics
Xiaomi Redmi S2
2122 Points ∼100%
Average Qualcomm Snapdragon 625 (1631 - 2157, n=17)
1968 Points ∼93% -7%
Motorola Moto G6 Plus
1802 Points ∼85% -15%
Nokia 6 2018
1733 Points ∼82% -18%
Samsung Galaxy A6 2018
1705 Points ∼80% -20%
Average of class Smartphone (532 - 4150, n=376)
1522 Points ∼72% -28%
Huawei Y7 2018
1280 Points ∼60% -40%
2560x1440 Sling Shot OpenGL ES 3.0 Graphics
Average of class Smartphone (55 - 8312, n=376)
1599 Points ∼100% +115%
Motorola Moto G6 Plus
1258 Points ∼79% +70%
Nokia 6 2018
1249 Points ∼78% +68%
Xiaomi Redmi S2
742 Points ∼46%
Average Qualcomm Snapdragon 625 (390 - 751, n=17)
710 Points ∼44% -4%
Huawei Y7 2018
524 Points ∼33% -29%
Samsung Galaxy A6 2018
264 Points ∼17% -64%
2560x1440 Sling Shot OpenGL ES 3.0
Average of class Smartphone (69 - 6454, n=384)
1361 Points ∼100% +57%
Motorola Moto G6 Plus
1348 Points ∼99% +55%
Nokia 6 2018
1332 Points ∼98% +54%
Xiaomi Redmi S2
867 Points ∼64%
Average Qualcomm Snapdragon 625 (476 - 876, n=17)
826 Points ∼61% -5%
Huawei Y7 2018
603 Points ∼44% -30%
Samsung Galaxy A6 2018
325 Points ∼24% -63%
1280x720 offscreen Ice Storm Unlimited Physics
Average Qualcomm Snapdragon 625 (14195 - 16267, n=16)
15727 Points ∼100% +11%
Xiaomi Redmi S2
14195 Points ∼90%
Nokia 6 2018
13196 Points ∼84% -7%
Motorola Moto G6 Plus
12845 Points ∼82% -10%
Average of class Smartphone (3958 - 37475, n=530)
12735 Points ∼81% -10%
Huawei Y7 2018
9153 Points ∼58% -36%
Samsung Galaxy A6 2018
6184 Points ∼39% -56%
1280x720 offscreen Ice Storm Unlimited Graphics Score
Nokia 6 2018
18572 Points ∼100% +142%
Motorola Moto G6 Plus
18449 Points ∼99% +141%
Average of class Smartphone (2465 - 162695, n=530)
17607 Points ∼95% +130%
Average Qualcomm Snapdragon 625 (7668 - 13491, n=16)
12957 Points ∼70% +69%
Huawei Y7 2018
9713 Points ∼52% +27%
Xiaomi Redmi S2
7668 Points ∼41%
Samsung Galaxy A6 2018
5376 Points ∼29% -30%
1280x720 offscreen Ice Storm Unlimited Score
Nokia 6 2018
17030 Points ∼100% +99%
Motorola Moto G6 Plus
16818 Points ∼99% +97%
Average of class Smartphone (2915 - 77599, n=531)
14817 Points ∼87% +73%
Average Qualcomm Snapdragon 625 (8541 - 14003, n=16)
13468 Points ∼79% +58%
Huawei Y7 2018
9583 Points ∼56% +12%
Xiaomi Redmi S2
8541 Points ∼50%
Samsung Galaxy A6 2018
5537 Points ∼33% -35%
GFXBench (DX / GLBenchmark) 2.7
1920x1080 T-Rex HD Offscreen C24Z16
Average of class Smartphone (4.1 - 251, n=554)
30.4 fps ∼100% +38%
Nokia 6 2018
30 fps ∼99% +36%
Motorola Moto G6 Plus
30 fps ∼99% +36%
Average Qualcomm Snapdragon 625 (22 - 23, n=17)
22.9 fps ∼75% +4%
Xiaomi Redmi S2
22 fps ∼72%
Huawei Y7 2018
16 fps ∼53% -27%
Samsung Galaxy A6 2018
12 fps ∼39% -45%
T-Rex HD Onscreen C24Z16
Xiaomi Redmi S2
35 fps ∼100%
Nokia 6 2018
31 fps ∼89% -11%
Motorola Moto G6 Plus
28 fps ∼80% -20%
Huawei Y7 2018
27 fps ∼77% -23%
Average of class Smartphone (6.9 - 120, n=557)
24.5 fps ∼70% -30%
Average Qualcomm Snapdragon 625 (17 - 35, n=17)
22.9 fps ∼65% -35%
Samsung Galaxy A6 2018
19 fps ∼54% -46%
GFXBench 3.0
off screen Manhattan Offscreen OGL
Average of class Smartphone (2.2 - 132, n=476)
16.3 fps ∼100% +68%
Nokia 6 2018
14 fps ∼86% +44%
Motorola Moto G6 Plus
14 fps ∼86% +44%
Xiaomi Redmi S2
9.7 fps ∼60%
Average Qualcomm Snapdragon 625 (3.1 - 10, n=17)
9.43 fps ∼58% -3%
Huawei Y7 2018
7.1 fps ∼44% -27%
Samsung Galaxy A6 2018
5.4 fps ∼33% -44%
on screen Manhattan Onscreen OGL
Xiaomi Redmi S2
18 fps ∼100%
Average of class Smartphone (4.1 - 115, n=479)
15.6 fps ∼87% -13%
Nokia 6 2018
15 fps ∼83% -17%
Huawei Y7 2018
14 fps ∼78% -22%
Motorola Moto G6 Plus
13 fps ∼72% -28%
Average Qualcomm Snapdragon 625 (7.4 - 19, n=17)
10.6 fps ∼59% -41%
Samsung Galaxy A6 2018
10 fps ∼56% -44%
GFXBench 3.1
off screen Manhattan ES 3.1 Offscreen
Average of class Smartphone (1.3 - 88, n=339)
13.9 fps ∼100% +117%
Nokia 6 2018
9.8 fps ∼71% +53%
Motorola Moto G6 Plus
9.8 fps ∼71% +53%
Average Qualcomm Snapdragon 625 (3.5 - 14, n=17)
6.66 fps ∼48% +4%
Xiaomi Redmi S2
6.4 fps ∼46%
Huawei Y7 2018
4.6 fps ∼33% -28%
Samsung Galaxy A6 2018
3.2 fps ∼23% -50%
on screen Manhattan ES 3.1 Onscreen
Xiaomi Redmi S2
14 fps ∼100%
Average of class Smartphone (2.6 - 110, n=342)
13.6 fps ∼97% -3%
Nokia 6 2018
10 fps ∼71% -29%
Huawei Y7 2018
10 fps ∼71% -29%
Motorola Moto G6 Plus
9.4 fps ∼67% -33%
Samsung Galaxy A6 2018
6.9 fps ∼49% -51%
Average Qualcomm Snapdragon 625 (3.1 - 14, n=17)
6.52 fps ∼47% -53%
GFXBench
off screen Car Chase Offscreen
Average of class Smartphone (0.72 - 54, n=271)
9.64 fps ∼100% +168%
Nokia 6 2018
5.6 fps ∼58% +56%
Motorola Moto G6 Plus
5.6 fps ∼58% +56%
Xiaomi Redmi S2
3.6 fps ∼37%
Average Qualcomm Snapdragon 625 (3.4 - 3.8, n=16)
3.52 fps ∼37% -2%
Huawei Y7 2018
2.6 fps ∼27% -28%
Samsung Galaxy A6 2018
2 fps ∼21% -44%
on screen Car Chase Onscreen
Average of class Smartphone (1.1 - 58, n=274)
8.71 fps ∼100% +18%
Xiaomi Redmi S2
7.4 fps ∼85%
Nokia 6 2018
5.9 fps ∼68% -20%
Huawei Y7 2018
5.4 fps ∼62% -27%
Motorola Moto G6 Plus
5.3 fps ∼61% -28%
Samsung Galaxy A6 2018
4 fps ∼46% -46%
Average Qualcomm Snapdragon 625 (3.1 - 7.4, n=16)
3.98 fps ∼46% -46%

Legend

 
Xiaomi Redmi S2 Qualcomm Snapdragon 625, Qualcomm Adreno 506, 32 GB eMMC Flash
 
Huawei Y7 2018 Qualcomm Snapdragon 430 (MSM8937), Qualcomm Adreno 505, 16 GB eMMC Flash
 
Motorola Moto G6 Plus Qualcomm Snapdragon 630, Qualcomm Adreno 508, 64 GB eMMC Flash
 
Nokia 6 2018 Qualcomm Snapdragon 630, Qualcomm Adreno 508, 32 GB eMMC Flash
 
Samsung Galaxy A6 2018 Samsung Exynos 7870 Octa, ARM Mali-T830 MP2, 32 GB eMMC Flash

In the browser benchmarks too, the Redmi S2 fulfilled our expectations. The test results place the Xiaomi smartphone exactly in the middle of our comparison list. In everyday use, these results come to expression as smooth browser operation and short load times. Websites with lots of media content present no challenge for our test device.

JetStream 1.1 - 1.1 Total Score
Average of class Smartphone (10.8 - 90938, n=413)
256 Points ∼100% +887%
Nokia 6 2018 (Browser: Chrome 65)
28.167 Points ∼11% +9%
Motorola Moto G6 Plus (Chrome 66)
27.971 Points ∼11% +8%
Average Qualcomm Snapdragon 625 (21.3 - 31.8, n=17)
27.2 Points ∼11% +5%
Xiaomi Redmi S2 (Chrome 67)
25.928 Points ∼10%
Samsung Galaxy A6 2018 (Chrome 64.0.3282.137)
20.877 Points ∼8% -19%
Huawei Y7 2018 (Chrome 66)
17.86 Points ∼7% -31%
Octane V2 - Total Score
Average of class Smartphone (1506 - 43280, n=549)
5464 Points ∼100% +15%
Motorola Moto G6 Plus (Chrome 66)
5011 Points ∼92% +6%
Nokia 6 2018 (Browser: Chrome 65)
4993 Points ∼91% +5%
Xiaomi Redmi S2 (Chrome 67)
4737 Points ∼87%
Average Qualcomm Snapdragon 625 (3781 - 4979, n=17)
4524 Points ∼83% -4%
Samsung Galaxy A6 2018 (Chrome 64.0.3282.137)
3739 Points ∼68% -21%
Huawei Y7 2018 (Chrome 66)
3363 Points ∼62% -29%
Mozilla Kraken 1.1 - Total Score
Huawei Y7 2018 (Chrome 66)
13541 ms * ∼100% -35%
Samsung Galaxy A6 2018 (Chrome 64.0.3282.137)
11807.6 ms * ∼87% -18%
Average of class Smartphone (603 - 59466, n=569)
11571 ms * ∼85% -15%
Xiaomi Redmi S2 (Chrome 67)
10020.9 ms * ∼74%
Nokia 6 2018 (Browser: Chrome 65)
9922.7 ms * ∼73% +1%
Motorola Moto G6 Plus (Chrome 66)
9796.9 ms * ∼72% +2%
Average Qualcomm Snapdragon 625 (8028 - 12194, n=17)
9289 ms * ∼69% +7%
WebXPRT 2015 - Overall Score
Nokia 6 2018
117 Points ∼100% +19%
Average of class Smartphone (27 - 362, n=277)
109 Points ∼93% +11%
Motorola Moto G6 Plus (Chrome 66)
108 Points ∼92% +10%
Xiaomi Redmi S2 (Chrome 67)
98 Points ∼84%
Average Qualcomm Snapdragon 625 (60 - 113, n=12)
90.5 Points ∼77% -8%
Samsung Galaxy A6 2018 (Chrome 64.0.3282.137)
89 Points ∼76% -9%
Huawei Y7 2018 (Chrome 66)
82 Points ∼70% -16%

* ... smaller is better

The Xiaomi Redmi S2 offers users 32 GB of internal storage, 25 GB of which is available for personal data and apps. Alternatively, a version of the Redmi S2 with 64 GB of storage is available for purchase. In our benchmark test, the storage medium performed as one would expect, given that this is a solid mid-range smartphone. The write and read rates fall, once again, exactly in the middle of the competition.

The built-in microSD card reader performs less well, but not badly. The card reader falls just short of the rest of the devices in our comparison list, but even so, it managed good data transfer rates with our Toshiba Exceria Pro M501 reference memory card.

Xiaomi Redmi S2Huawei Y7 2018Motorola Moto G6 PlusNokia 6 2018Samsung Galaxy A6 2018Average 32 GB eMMC FlashAverage of class Smartphone
AndroBench 3-5
-25%
17%
-16%
-27%
-30%
-33%
Sequential Write 256KB SDCard
60.9 (Toshiba Exceria Pro M501)
61.5
1%
62.13 (Toshiba Exceria Pro M501)
2%
61.29 (Toshiba Exceria Pro M501)
1%
65.66 (Toshiba Exceria Pro M501)
8%
47.1 (3.4 - 87.1, n=111)
-23%
45.3 (3.4 - 87.1, n=314)
-26%
Sequential Read 256KB SDCard
81.8 (Toshiba Exceria Pro M501)
85
4%
83.65 (Toshiba Exceria Pro M501)
2%
83.42 (Toshiba Exceria Pro M501)
2%
81.39 (Toshiba Exceria Pro M501)
-1%
66.3 (8.2 - 96.5, n=111)
-19%
63.6 (8.2 - 96.5, n=314)
-22%
Random Write 4KB
68.71
9.5
-86%
62.76
-9%
15.3
-78%
10.68
-84%
18.9 (0.75 - 77.3, n=149)
-72%
15.7 (0.14 - 164, n=598)
-77%
Random Read 4KB
52.45
38.8
-26%
58.39
11%
38.78
-26%
24.54
-53%
36.2 (3.59 - 117, n=149)
-31%
37.6 (1.59 - 173, n=599)
-28%
Sequential Write 256KB
117.65
71.5
-39%
216.09
84%
118.32
1%
100.64
-14%
94.6 (14.8 - 189, n=149)
-20%
78.8 (2.99 - 246, n=599)
-33%
Sequential Read 256KB
261.44
256
-2%
286.64
10%
272.59
4%
208.44
-20%
230 (25.8 - 440, n=149)
-12%
227 (12.1 - 895, n=599)
-13%

Games - Xiaomi phone good for playing games

In the Xiaomi Redmi S2, an Adreno 506 graphics unit provides the performance necessary for games and 3D applications to run smoothly. This mid-range GPU is already somewhat old, but it has no problem rendering more graphics-heavy games. Users only have to accept that load times may be somewhat longer.

The games we tested with the GameBench software, “Dead Trigger 2” and “Asphalt 8”, presented no challenge for the Redmi S2, even at higher graphics settings. However, the somewhat slow position sensor substantially impaired the smartphone's ability to run the games smoothly, and over extended periods, the level of friction between the screen and the user's fingertips is a little too high.

Dead Trigger 2
Dead Trigger 2
Asphalt 8
Asphalt 8
Asphalt 8: Airborne
 SettingsValue
 high30 fps
 very low30 fps
  Your browser does not support the canvas element!
Dead Trigger 2
 SettingsValue
 high30 fps
  Your browser does not support the canvas element!

Emissions - Redmi S2 remains relatively cool

GFX-Bench Manhattan 3.1
GFX-Bench Manhattan 3.1

The Redmi S2 hardly warms up at all in operation. In idle mode, we measured maximum surface temperatures of just over 28°C (~82.4°F). Under load, these temperatures rose somewhat and did end up crossing the 40°C (104°F) mark. In everyday use, the smartphone feels slightly warm, but never grows hot.

The GFX Bench benchmark's heavy load test, Manhattan 3.1, also showed that our test device's performance only dropped minimally over the course of the test. The smartphone reached 861 FPS in the beginning; after 30 cycles, the frame rate still held at a good 851. It is thus reasonable to assume that system performance will not be limited as a result of high temperatures.

Max. Load
 40.1 °C
104 F
37.5 °C
100 F
39.4 °C
103 F
 
 41.4 °C
107 F
37.2 °C
99 F
39.8 °C
104 F
 
 40.5 °C
105 F
37.6 °C
100 F
38.3 °C
101 F
 
Maximum: 41.4 °C = 107 F
Average: 39.1 °C = 102 F
36.4 °C
98 F
38.5 °C
101 F
39.1 °C
102 F
36 °C
97 F
38.6 °C
101 F
40.2 °C
104 F
35.9 °C
97 F
38.2 °C
101 F
39.4 °C
103 F
Maximum: 40.2 °C = 104 F
Average: 38 °C = 100 F
Power Supply (max.)  41 °C = 106 F | Room Temperature 22 °C = 72 F | Voltcraft IR-260
(-) The average temperature for the upper side under maximal load is 39.1 °C / 102 F, compared to the average of 33.2 °C / 92 F for the devices in the class Smartphone.
(±) The maximum temperature on the upper side is 41.4 °C / 107 F, compared to the average of 35.8 °C / 96 F, ranging from 22.4 to 51.7 °C for the class Smartphone.
(±) The bottom heats up to a maximum of 40.2 °C / 104 F, compared to the average of 34.3 °C / 94 F
(+) In idle usage, the average temperature for the upper side is 27.5 °C / 82 F, compared to the device average of 33.2 °C / 92 F.
heat distribution - front
heat distribution - front
heat distribution - back
heat distribution - back

Speakers

PinkNoise - speaker characteristics
PinkNoise - speaker characteristics

The Redmi S2's speakers reach a moderate volume and tend to produce faint buzzing and crackling sounds at the highest setting. While voices sound loud and clear, the sound quality is not good enough for listening to music, for example. The overrepresented mid-tones and strikingly underrepresented high and low tones leave the sound lacking in fine details. Compared to other smartphones in this price bracket however, the quality of the speakers is still good.

A 3.5mm jack enables the user to connect external audio devices. The jack is somewhat tight and fails to lock a plug into place; instead it appears that the tightness itself prevents the plug from falling out.

dB(A) 0102030405060708090Deep BassMiddle BassHigh BassLower RangeMidsHigher MidsLower HighsMid HighsUpper HighsSuper Highs202728.32525.9273129.529.74031.429.55032.630.66324.121.88023.122.110024.122.112517.217.216016.618.420016.82825016.436.331514.145.140013.855.950013.659.963012.163.380011.565.1100011.567.4125011.266.5160011.266.9200011.269.2250011.268.9315011.168.3400011.267.6500011.264.1630011.457.4800011.458.11000011.362.61250011.452.71600011.438SPL57.159.566.757.96023.978.2N10.612.319.310.913.70.539.8median 11.4median 59.9Delta1.813.935.236.932.938.737.236.931.737.939.63728.335.427.332.926.93226.738.82443.220.947.220.951.319.556.218.563.517.566.817.569.615.772.815.872.416.675.615.87215.471.915.574.21671.215.880.71679.916.372.816.372.716.271.416.465.516.463.228.6871.167.8median 16.4median 71.22.17.8hearing rangehide median Pink NoiseXiaomi Redmi S2Samsung Galaxy A6 2018
Frequency diagram (checkboxes can be checked and unchecked to compare devices)
Xiaomi Redmi S2 audio analysis

(±) | speaker loudness is average but good (78.2 dB)
Bass 100 - 315 Hz
(-) | nearly no bass - on average 32.1% lower than median
(±) | linearity of bass is average (11.4% delta to prev. frequency)
Mids 400 - 2000 Hz
(±) | higher mids - on average 5.4% higher than median
(+) | mids are linear (6.7% delta to prev. frequency)
Highs 2 - 16 kHz
(±) | higher highs - on average 5.2% higher than median
(+) | highs are linear (5% delta to prev. frequency)
Overall 100 - 16.000 Hz
(±) | linearity of overall sound is average (27% difference to median)
Compared to same class
» 65% of all tested devices in this class were better, 8% similar, 26% worse
» The best had a delta of 13%, average was 25%, worst was 44%
Compared to all devices tested
» 79% of all tested devices were better, 5% similar, 16% worse
» The best had a delta of 3%, average was 21%, worst was 53%

Samsung Galaxy A6 2018 audio analysis

(+) | speakers can play relatively loud (87 dB)
Bass 100 - 315 Hz
(-) | nearly no bass - on average 26.5% lower than median
(±) | linearity of bass is average (7.6% delta to prev. frequency)
Mids 400 - 2000 Hz
(+) | balanced mids - only 2.8% away from median
(+) | mids are linear (5.5% delta to prev. frequency)
Highs 2 - 16 kHz
(+) | balanced highs - only 3.5% away from median
(+) | highs are linear (6.2% delta to prev. frequency)
Overall 100 - 16.000 Hz
(±) | linearity of overall sound is average (17.4% difference to median)
Compared to same class
» 3% of all tested devices in this class were better, 4% similar, 93% worse
» The best had a delta of 13%, average was 25%, worst was 44%
Compared to all devices tested
» 27% of all tested devices were better, 6% similar, 66% worse
» The best had a delta of 3%, average was 21%, worst was 53%

Battery Life - Xiaomi smartphone with long battery life

The Xiaomi Redmi S2 is not a particularly energy-saving device. According to our measurements, the Redmi phone's energy usage significantly exceeds that of the competition. Even in idle mode, we measured a power draw of at least 2 watts. Under load, the usage rose to a maximum of 6.7 watts. Nevertheless, the 10-watt power supply that comes with the device can provide the energy necessary to charge and run the smartphone. The power supply fully charges the 3080 mAh battery in just over 2 hours.

Power Consumption
Off / Standbydarklight 0.05 / 0.4 Watt
Idledarkmidlight 2 / 2.6 / 3.5 Watt
Load midlight 4.6 / 6.7 Watt
 color bar
Key: min: dark, med: mid, max: light        Metrahit Energy
Xiaomi Redmi S2
3080 mAh
Huawei Y7 2018
3000 mAh
Motorola Moto G6 Plus
3200 mAh
Nokia 6 2018
3000 mAh
Samsung Galaxy A6 2018
3000 mAh
Average Qualcomm Snapdragon 625
 
Average of class Smartphone
 
Power Consumption
26%
41%
44%
48%
31%
32%
Idle Minimum *
2
0.9
55%
0.5
75%
0.67
66%
0.81
59%
0.981 (0.49 - 2.2, n=17)
51%
0.882 (0.2 - 3.4, n=631)
56%
Idle Average *
2.6
1.9
27%
1.78
32%
1.76
32%
1.26
52%
1.985 (0.87 - 3.92, n=17)
24%
1.724 (0.6 - 6.2, n=630)
34%
Idle Maximum *
3.5
2.3
34%
1.81
48%
1.78
49%
1.3
63%
2.27 (0.9 - 4.03, n=17)
35%
1.999 (0.74 - 6.6, n=631)
43%
Load Average *
4.6
4.7
-2%
3.3
28%
2.82
39%
2.87
38%
3.51 (1.69 - 6.2, n=17)
24%
4.03 (0.8 - 10.8, n=625)
12%
Load Maximum *
6.7
5.7
15%
5.14
23%
4.56
32%
4.82
28%
5.38 (3.8 - 7.2, n=17)
20%
5.73 (1.2 - 14.2, n=625)
14%

* ... smaller is better

Battery Life

In our battery tests, the Xiaomi Redmi S2's battery proves to have real stamina. In our WLAN test, designed to simulate everyday use, the smartphone ran for almost 19 hours. Our test device's battery even ran a continuous video loop for over 15 hours before cutting out. Compared to other devices in its price range, the Redmi S2's performance here is very good, securing it the top spot in our comparison list.

Battery Runtime
NBC WiFi Websurfing Battery Test 1.3
18h 47min
Big Buck Bunny H.264 1080p
15h 10min
Load (maximum brightness)
1h 29min
Xiaomi Redmi S2
3080 mAh
Huawei Y7 2018
3000 mAh
Motorola Moto G6 Plus
3200 mAh
Nokia 6 2018
3000 mAh
Samsung Galaxy A6 2018
3000 mAh
Battery Runtime
35%
92%
88%
62%
Reader / Idle
1305
1846
1833
1616
H.264
910
687
-25%
542
-40%
675
-26%
868
-5%
WiFi v1.3
1127
624
-45%
702
-38%
942
-16%
608
-46%
Load
89
245
175%
404
354%
362
307%
301
238%

Pros

+ microSD and two nanoSIM cards simultaneously
+ 16 MP front camera
+ stable case
+ long battery life

Cons

- mediocre main camera
- apps cannot be stored on microSD card
- no USB Type-C connection
- mediocre sound quality

Verdict - Xiaomi Redmi S2: Top choice for selfie-lovers

In Review: Xiaomi Redmi S2. Test device courtesy of notebooksbilliger.de.
In Review: Xiaomi Redmi S2. Test device courtesy of notebooksbilliger.de.

In our tests, the Redmi S2 proves to be a good mid-range smartphone that can stride boldly into the ranks of the competition. To attract selfie-lovers, Xiaomi has equipped our test device with a very good front camera; a unique selling point compared to its competitors. The main camera too, is good for the occasional snapshot. 

The benchmark results attest to the smartphone's good system performance that should be adequate for nearly any application scenario. Bargain hunters and those who like devices with solid, basic hardware will be pleased with Xiaomi's latest release in the Redmi series and can confidently snatch up this deal.

 The Xiaomi Redmi S2 is a good mid-range smartphone. With its high-resolution front camera, the device is not just suited to selfie-lovers; thanks to its good system performance, it may appeal to other interested customers as well.

Xiaomi Redmi S2 - 07/11/2018 v6
Mike Wobker

Chassis
80%
Keyboard
65 / 75 → 87%
Pointing Device
81%
Connectivity
39 / 60 → 65%
Weight
91%
Battery
98%
Display
76%
Games Performance
28 / 63 → 44%
Application Performance
51 / 70 → 72%
Temperature
89%
Noise
100%
Audio
59 / 91 → 65%
Camera
71%
Average
71%
81%
Smartphone - Weighted Average

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> Notebook / Laptop Reviews and News > Reviews > Xiaomi Redmi S2 Smartphone Review
Mike Wobker, 2018-07-16 (Update: 2018-07-16)