Xiaomi Redmi K40 Review: A Great Deal In This Price Bracket

Xiaomi Redmi K40 Review

In 2021, Xiaomi announced the Redmi K40 (M2011K2C) smartphone. It has a Qualcomm Snapdragon 870 processor, 6 GB of RAM, and 128 GB of internal memory.

The Xiaomi Redmi K40 comes pre-installed with Android OS v11.0. The battery is a  non-removable Li-Po 4500 mAh. It has a 6.67-inch IPS display with a resolution of 1440 x 3200 pixels. 

In terms of cameras, the Redmi K40 has a triple camera arrangement on the back, with a 48-megapixel primary camera with an f/1.79 aperture, an 8-megapixel camera, and a 5-megapixel camera. Autofocus is available on the back camera. It includes a single selfie camera with a 20-megapixel sensor on the front.

The Redmi K40 contains 128GB of internal storage and has MIUI 12 from Android 11. The Xiaomi Redmi K40 is a dual-SIM (GSM and GSM) smartphone that takes Nano-SIM and Nano-SIM cards. The Redmi K40 weighs 196.00 grammes and is 163.70 x 76.40 x 7.80mm (height x width x thickness). It came in three colours: Dreamland, Glossy Black, and Icy White.

Xiaomi Redmi K40 costs Rs. 22,490 in India.


The Redmi K40 is packaged in a standard-size box. The charger and cord that had vanished from the Mi 11’s box have reappeared in the K40’s. A 33w charger is supplied, and we’ll get into it later.

It is only 196g in weight and 7.8mm thick. The Mi 11 design is carried over to the whole back. The camera module is more extended, and the parts are more uniformly distributed. This improves the back’s appearance over its predecessor. The main hue of the K40 is a red and blue gradient. In various lighting, it refracts blue and red.

The fingerprint sensor incorporated in the power button on the side is slightly elevated. This is the first time Redmi has been able to compete with Xiaomi in terms of design.


The K40 series features a flat E4, 1080p, 120hz refresh rate OLED panel this year which is one of the K40 series’ primary selling factors is the screen. The performance is genuinely excellent, with 1300 nits of peak brightness and a 5,000,000:1 contrast ratio while consuming 15% less power. Multi-finger control should be more responsive than previous phones, thanks to supporting a three-finger 360hz touch sample rate. However, the user perceives the improvement in experience more than the improvement in parameters.

Gaming & Performance

The Snapdragon 870 is a well-balanced processor, as you may have seen in other phones like Motorola Edge S. It was not a pleasant experience. So it appears that the phone delivers a superior gaming experience than the Edge S for titles that were optimised for the Redmi model. And the temperature never rose over 50 degrees Celsius. The gaming experience would be poorer than the Edge S if there were no focused improvements.


Autofocus is included on the Xiaomi Redmi K40’s camera. Autofocus is a camera function that fine-tunes the camera’s focus; it’s a useful feature on this smartphone. , The back camera incorporates optical image stabilisation (OIS) to prevent camera shake.

In real life, the main camera on the K40 underexposed samples in the daytime. The dynamic range is likewise lacking, with significant detail loss in dark places. The resolution is insufficient and colours are also lacking in vibrancy. . The K40 loses out in all daylight scenarios, except for somewhat improved management of the purple-fringing problem.


A 4520mAh battery powers the K40. According to our inspection, a half-hour of Tiktok and a half-hour of 1080p online video utilise just 5% of the power. The Genshin Impact wastes 18% of your time after 30 minutes. The BrightRidge uses 20% of your time after 20 minutes. This optimization of the battery is still decent.

Although the K40 still uses 33 watts for charging, it has been greatly improved. It charges up to 69 per cent in half an hour and takes 54 minutes to completely charge. As a result, this is faster than the 40w charging of many other models.

Takeaway: Excellent Smartphone In A Budget

To summaries, if you’re searching for a phone with good performance, minimal heating, and a camera that’s not too demanding, the K40 is an excellent choice. There are a few unexpected features, like the superb E4 screen and stylish design. Given its flaws, it isn’t the best phone, but it is the most comfortable phone in this price range, at least for the time being.

People Also Read: OnePlus 9 Pro Review: The Best OnePlus Smartphone Ever

Xiaomi Redmi K40 Review

Screen Size 6.7 inches, 108.4 cm2 (~90.3% screen-to-body ratio)
CPU/Processor Octa-core (1x3.2 GHz Kryo 585 & 3x2.42 GHz Kryo 585 & 4x1.80 GHz Kryo 585)
Storage 128GB 6GB RAM, 128GB 8GB RAM, 256GB 8GB RAM, 256GB 12GB RAM
Primary Camera 48 MP, f/1.8, 26mm (wide), 1/2", 0.8µm, PDAF 8 MP, f/2.2, 119˚ (ultrawide) 5 MP, f/2.4, 50mm (macro), 1/5.0", 1.12µm
Secondary Camera 20 MP, f/2.5, (wide), 1/3.4", 0.8µm
Battery Li-Po 4520 mAh, non-removable
Release Date 25th February 2021
Price Rs. 22,490
Display Type Super AMOLED, 120Hz, HDR10+, 1300 nits (peak)
Size 6.67 inches, 107.4 cm2 (~85.9% screen-to-body ratio)
Screen Resolution 1080 x 2400 pixels, 20:9 ratio (~395 ppi density)
Protection Corning Gorilla Glass 5
Main Camera
48 MP, f/1.8, 26mm (wide), 1/2", 0.8µm, PDAF 8 MP, f/2.2, 119˚ (ultrawide) 5 MP, f/2.4, 50mm (macro), 1/5.0", 1.12µm
Features LED flash, HDR, panorama
Videos 4K@30fps, 1080p@30/60/120/240/960fps, gyro-EIS
Selfie Camera
Types Single 20 MP, f/2.5, (wide), 1/3.4", 0.8µm
Features HDR
Videos 1080p@30fps, 720p@120fps
Operating System (OS) Android 11, MIUI 12
Chipset  Qualcomm SM8250-AC Snapdragon 870 5G (7 nm)
CPU Octa-core (1x3.2 GHz Kryo 585 & 3x2.42 GHz Kryo 585 & 4x1.80 GHz Kryo 585)
GPU  Adreno 650
Dimensions 163.7 x 76.4 x 7.8 mm (6.44 x 3.01 x 0.31 in)
Weight 196 g (6.91 oz)
Built Quality Glass front (Gorilla Glass 5), glass back (Gorilla Glass 5), aluminium frame
Card Slot NO
Internal 128GB 6GB RAM, 128GB 8GB RAM, 256GB 8GB RAM, 256GB 12GB RAM
Speaker Stereo speakers
Type Li-Po 4520 mAh, non-removable
Charging Fast charging 33W, 100% in 52 min 
WLAN: Wi-Fi 802.11 a/b/g/n/ac/6, dual-band, Wi-Fi Direct, hotspot
Bluetooth: Yes, 5.1, A2DP, LE 5.2, A2DP, LE, aptX HD
GPS: Yes, with dual-band A-GPS, GLONASS, BDS, GALILEO, QZSS, NavIC
NFC: Yes
USB: USB Type-C 2.0, USB On-The-Go
Sensors : Fingerprint (side-mounted), accelerometer, gyro, proximity, compass, colour spectrum

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