The Xiaomi Mi 5s Plus features a 5.7" IPS display of 1080p resolution, probably the same utilized by the first Mi Note. A density of 386ppi is more than respectable and leaves the Snapdragon 821 chip with power to spare on tasks and productivity, so we don't mind the lack of Quad HD resolution.
Unfortunately, Xiaomi didn't mention any specific glass protection for the screen. The Mi 5s Plus acquired lots of prominent scratches on top of its display just in the week we had it for a review. We suggest that you apply a screen protector on it as soon as you take the phone out of its box.
Other than that, the screen offers great viewing angles and there is hardly any color shift or contrast loss when looking the Mi 5s Plus display at an angle.
Xiaomi claims the screen will provide up to 550 nits of max brightness. Our test results confirmed and even exceeded the claim for maximum brightness as we measured 630nits worth of luminance.
The minimum display brightness is 1 nit, which means the screen should be perfectly suitable for late-night reading in a dark room. The screen's contrast ratio is excellent as well at 1448:1, once again exceeding the promised contrast ratio of 1300:1.
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When it comes to color rendering, the Mi 5s Plus has an excellent color rendering with an average DeltaE of 3.3 and a maximum deviation of 7.9 in the blue color. If all colors stay below 4, the screen is considered to be of perfect calibration level accuracy and the Mi 5s Plus almost achieves that, only the blues jumped over the 4.0 threshold.
Note that we did our color test in Standard (constant) screen mode. If you opt for the Auto one, you will get punchier colors at the expense of color calibration.
Finally, the screen of the Xiaomi Mi 5s Plus performed just average in our sunlight legibility test. It wasn't able to reproduce the Mi 5s high score even though it offers a superb maximum brightness.
The Xiaomi Mi 5s Plus is powered by a 3,800mAh battery, which seems enough for a phablet. It's also 600mAh beefier than the one inside the Mi 5s.
We ran our battery test, and the Xiaomi Mi 5s Plus scored a 104h rating, which means you can count on the battery to last almost four and a half days if you do an hour each of calling, web browsing and video playback a day.
The phone outed consistently good scores across all battery tests, including single and dual SIM standby.
If you want to use the phone with two SIM cards, you'll end up with a 96h rating, or four days.
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 Mi 5s Plus supports 8 LTE bands, quad-band GSM and quad-band 3G connectivity with HSPA support. You can tap to an LTE network on either SIM, but once you do, the second one will be limited to 3G or GSM connectivity. You can even have both registered on 3G networks, when 4G is not available.
The rest of the connectivity features include single-band Wi-Fi a/b/g/n/ac support and Wi-Fi Direct. There is also support for Bluetooth 4.2, NFC, GPS with GLONASS and Beidou.
There is no FM radio support.
Xiaomi Mi 5s Plus comes with USB Type-C port. Media transfer mode is supported for accessing the phone's built-in memory over a USB connection. The port also supports USB On-the-go for connecting USB peripherals such as pen drives, keyboards or USB hard drives, but you'll need to buy a proper adapter for that.
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 Mi 5s Plus into a universal remote. Xiaomi provides its MiRemote app right out of the box.