The Xiaomi Redmi 3S features a 5" 720p IPS screen, the same size and resolution available on the original Redmi 3, for a pixel density of 294ppi. That's near Retina-grade, enough for crisp images and sharp text.
Taking a closer look at it under our digital microscope reveals a standard RGB arrangement of the sub-pixels that make up the Xiaomi Redmi 3S LCD panel.
Unfortunately, there is still no information on the protective coating, and there is a good chance it doesn't have any enhanced scratch-resistance.
The Xiaomi Redmi 3S achieved a bit lower maximum brightness compared to its Redmi 3 predecessor - 489nits vs. 520 nits. At the lowest level, the screen is not that dim at 13nits, which is a bit disappointing.
The black levels are OK for an LCD panel and, combined with the relatively high brightness, the Redmi 3S achieved a respectable contrast of 1087:1.
|Display test||100% brightness|
|Black, cd/m2||White, cd/m2|
With an average deviation (DeltaE) of 5.5 the screen's color accuracy is about average. The colors are punchy, but if you want a more color accurate representation you may want to try the Warm Color option - it changes the color calibration to a perfectly balanced one with an average DeltaE of 2.9.
Outdoors, the Xiaomi Redmi 3S is an above average performer regarding sunlight legibility. The glass on top of the display is reflective, but most of the time you'll have no problem viewing the screen content.
The Xiaomi Redmi 3S is powered by a 4,100mAh battery which is a serious power pack for a 5" device. It's also of the same capacity as the original Redmi 3.
We ran our battery test, and the Xiaomi Redmi 3S scored a 104h rating, which means you can count on the battery to last four days and then some if you do an hour each of calling, web browsing and video playback a day.
The endurance rating is about the same achieved by the Redmi 3 and 3 Pro which is about right. If you want to use the phone with two SIM cards, you'll get the same endurance.
The battery testing procedure is described in detail in case you're interested in the nitty-gritties. You can also check out our complete battery test table, where you can see how all of the smartphones we've tested will compare under your own typical use.
The Xiaomi Redmi 3S supports LTE connectivity, and you can tap to an LTE network on either SIM, but once you do, the second one will be limited to GSM connectivity only. As for that, the Redmi 3S also offers tri-band GSM connectivity. There is quad-band 3G connectivity with HSPA support.
The rest of the connectivity features include single-band Wi-Fi b/g/n/ support and Wi-Fi Direct. There is also support for Bluetooth 4.1, GPS with GLONASS and Beidou, plus an FM radio.
A microUSB 2.0 port handles charging and data connections. Media transfer mode is supported for accessing the phone's built-in memory over a USB connection. The microUSB port also supports USB On-the-go for connecting USB peripherals such as pen drives, keyboards or USB hard drives.
Wireless screen mirroring is available via the Miracast protocol.
The IR blaster is located on the top and coupled with the right software, it can be used to operate almost any remotely controlled home appliance, turning the Xiaomi Redmi 3S into a universal remote. Xiaomi provides its MiRemote app right out of the box.