Since the invention of the smartphone, users have been bothered by insufficient battery lives and always having to carry a powerbank with them.

We all know this scenario: if the day is about to end, so is the battery. In order to put an end to that, Chinese manufacturer Oukitel produces devices (K-series) with unusually big batteries since several years now.

With the new K6, Oukitel remained true to its tradition and launches again a middle class smartphone with a gigantic 6300mAh battery. The device also houses the new Mediatek P23 Octacore processor, 2 dual-cameras, 6GB of RAM and a 6-inch full-HD+ display in 18:9 ratio. Only judged by the equipment, K6 is just a better K5000.

If K6 really lasts for 3 days, as advertised by the manufacturer, and what else the smartphone can offer, you’ll find out in the following review. 

Oukitel K6 scope of delivery

Oukitel K6 Testbericht Lieferumfang

In contrast to well-known brands, Chinese manufacturers mostly deliver their smartphones with several accessories. Oukitel also provides additional equipment with K6. Besides the packaging and the smartphone, users receive a USB-C cable, a quick-charge power plug, an OTG cable, an adapter from USB-C to 3.5mm headphone jack and a silicone protective cover. Oukitel is very generous in providing that much additional equipment, and the user is well prepared for daily life with a smartphone. 

Design & build quality

Holding Oukitel K6 in the hand, you instantly notice the heavy weight. The scales confirm the impression: the smartphone weighs 260g. The weight is due to the huge battery, which also causes the above-average depth of 11mm. With the other dimensions of 158.7×76.3mm, the device is a challenge even for rather big hands and it requires getting used to. However, the rest of the build quality is really convincing.

Oukitel K6 Display 3 Oukitel K6 Design Verarbeitung 4

The 6-inch display with 18:9 ratio and curved edges dominates the front side. The phone is operated with on-screen buttons. Thanks to the small bezels, K6 remains relatively small with dimensions of 159x76mm. Above the panel, you find the notification LED, an LED flash and two camera lenses. The display glass is slightly rounded-off at the sides, but it merges noticeably in the black metal frame. USB-C port and microphone are located at the bottom, standby button and volume control are located on the right. They have good feedback, but they cannot convince because of their loose mounting. K6 does not offer a headphone connection, so you have to use the provided adapter in order to listen to music with headphones.

Oukitel K6’s curved rear consists of plastic, but it doesn’t seem low-grade. If light falls on the phone, the black plastic seems to be blue, which makes the device somewhat special. The dual-camera, placed in the middle, slightly juts out and has a dual-LED flash next to it. Below the camera, you can find the fingerprint scanner, which is a bit lowered into the casing.

Oukitel K6 Design Verarbeitung 5 Oukitel K6 Design Verarbeitung 1 Oukitel K6 Design Verarbeitung 2 Oukitel K6 Design Verarbeitung 6

Since the rear is not removable, the cards are placed in a tray at the smartphone’s side. You can either use 2 SIM cards simultaneously or 1 SIM and 1 micro-SD card for storage expansion.

All in all, K6 leaves a positive impression in terms of haptics. Small niggles like the loose buttons however show that Oukitel can still improve the build quality. The heavy weight is due to the phone’s construction, but before buying the device, you should decide if a bigger battery is worth the heavy weight.


The display glass is not specified; it is a 6-inch IPS panel with a 2160x1080pixels resolution and a pixel density of 402PPI. Images and fonts appear sharp and you cannot recognize any single pixels, even when looking closely.

Oukitel K6 Display 2 Oukitel K6 vs. Oukitel Mix 2 2

The display can also convince in the other categories and offers great contrasts, nice brightness (530 Lux) and good viewing angles. Colors are represented naturally and although the black value is not comparable to an OLED display, the image is still good while using the phone outside. The digitizer registers up to 10 points of contact simultaneously.

Oukitel wants to ease the user’s life and provides partly useful features in the menu, like Gesture Motion and Gesture Unlock. For instance, you can operate the phone via shortcuts in the standby mode in order to start certain functions quickly. You can also mute a call by turning your phone upside down.

The display is convincing and real eye candy.


In the second half of 2017, K6’s Helio P23 MT6763 Octa-Core processor was presented by Mediatek and should be a direct competitor of the popular Snapdragon 625. 8 cores, distributed to 2 clusters in SoC, should promise to provide always the highest performance with a maximum battery life at the same time. The maximum clock rate is 1.5 and 2GHz.

The result is the following: the Mediatek P23 processor scored 63,000 points in the Antutu benchmark and is therefore on the same level as the processor by Qualcomm. In terms of performance, Oukitel K6 plays in the same league as devices like Xiaomi Mi A1. Combined with a Mali G71 GPU, K6 can also meet higher demands and demanding games like Asphalt 8 run fluently with medium graphics settings. The phone does never get too hot.

Thanks to the big 6GB of RAM and its good speed of 5300MB/s, multitasking is also possible. The big 64GB internal storage has a reading/writing speed of 216.50/121.62MB/s.

Oukitel K6 uses the potential of the hardware well and provides an overall powerful system. The results in the benchmarks confirm that the phone belongs to the middle-class and that the Oukitel device can keep up with the strong competition.

P.S.: Unfortunately, we were not able to include the results of the Geekbench benchmark, as the test could not be carried out on the phone. The same happened when we tried it with Ulefone Power 3, which also houses the Helio P23.


Oukitel K6 houses an Android 7.1.1 system that includes the security patches from 5th December 2017. Compared to the Stock Android, the system includes some small changes, which however wouldn’t have been necessary. For instance, the icons resemble the Samsung design and some additional apps were installed.

oukitel k6 androidoukitel k6 android2 oukitel k6 android3

The additional apps include an emoji keyboard (full of advertisements), a pedometer, a data manager, a screenshot assistant and a so-called system manager. The latter makes it possible to “freeze” annoying apps like the keyboard and use a better alternative like the Googlekey board instead.

The system ran stable and didn’t have any weaknesses. If the look or the additional programs bother some users, they can easily make some changes, thanks to Android. However, we are not sure if it’s best to deliver a smartphone with apps full of advertisements.


Oukitel K6 houses 4 camera lenses, which are equally distributed to front and rear side. The front camera contains 2 lenses with 13MP and 8MP and has a single-LED flash next to it. The rear camera has 2 lenses with 21MP and 8MP, which are supported by a dual-LED flash in the dark.

We are already used to Chinese manufacturers who advertise with a dual-camera, but provide only one operative lens instead. Oukitel does the same, so you can use only one lens per side in reality.

Effects like the bokeh effect or a dual zoom are created only digitally and the pictures do not look as we would have wished.

Apart from that, images taken with K6 are quite mediocre for a middle class device. The device struggles with creating the right exposure, which is why bright areas are often overexposed. However, the HDR mode takes care of this problem. Dynamic range and sharpness are all right. In darkness, image noise occurs (as expected) and even the flash does not improve that.

Pictures taken with the front camera are sufficient, but selfie lovers are better off with another device.

K6 registers videos with 1920x1080pixels (full-HD) at maximum, but it clearly lacks optical or digital stabilization. Nevertheless, it re-focuses mostly reliably during recordings.

K6’s camera is quite disappointing, considering the price. If you value especially the camera in a smartphone, you should rather look at other devices.

Connectivity and communication

Oukitel K6 SimkartenOukitel K6 supports a lot of network frequencies:

  • 2G: GSM 850/900/1800/1900 MHz
  • 3G: WCDMA 900/2100 MHz
  • 4G: FDD-LTE 1/3/7/8/20 (2100/1800/2600/900/800 MHz)

The device always connected reliably to the nearest radio mast and is therefore on the same level with partly (significantly) more expensive devices.

oukitel k6 gps

The smartphone includes a GPS receiver (Beidu, Glonass), which determines the position fast. Because of the digital compass, the device is also suitable for pedestrian navigation.

Oukitel K6 provides Bluetooth 4.1 and dual-Band Wi-Fi b/g/n/ac as well. Voice quality was good during calls on both sides; the speaker is more suitable for the use of the speakerphone than for listening to music, because of its mediocre quality. Using the headphone connection adapter, you get a nice sound quality. K6 offers the common sensors for a middle-class smartphone:

  • Proximity sensor
  • Acceleration sensor
  • Digital compass
  • Gyroscope
  • Brightness sensor
  • NFC

The fingerprint scanner on the rear unlocked the device reliably in 9/10 attempts, but it takes a moment to wake K6 from stand-by.

In terms of connectivity and communication, K6 does not make a bad impression, but it does not beat the records either. The competition is way ahead in this category.


As already mentioned, Oukitel K6 houses a huge 6300mAh battery. In our test, the device had a run time of great 12 hours and 43 minutes in the PCMark benchmark. In other words: K6’s battery dies after 2 days of intense use, but with normal use, you can get even 3 days of run time. We were a little surprised when we compared the Oukitel phone to Xiaomi Mi Note 3, which got a run time of 11.5 hours with a 3500mAh battery and therefore has only a slightly lower run time than K6. The reason for that is the extremely energy saving processor of the Xiaomi phone.

Battery lifetime Result Unit: hours

For charging you should use the provided power supply unit, which charges the phone with 5V and 2.8A in 2 hours and 45 minutes.

At this point, we would like to stress the smartphone’s function to be used as a powerbank. By using the provided adapter, we could charge another device with a maximum current of 0.45A at 5V.


Conclusion and alternative

7b0527b80f61074535251c193165aaaa s131
Joscha Becking:

With K6, Oukitel tries to gain a foothold in the highly competitive middle class. By including the Helio P23, an awesome display and a big storage, K6 makes the first steps towards being included in our ranking of the best smartphone. The smartphone can convince in most categories. However, K6 is not perfect and has a rather big weak spot, the cameras, as well. However, if this doesn’t bother you, you get a real battery monster with great build quality by buying a K6.
The phone currently costs more than 200$, which seems a bit high, considering the more economic competitors like Ulefone Power 3, for instance. Probably the price will drop in the next few weeks (<180$), and then Oukitel K6 will be a recommendable purchase.

  • Design and build quality 70 %
  • Display 90 %
  • Performance 80 %
  • Camera 70 %
  • Communication and connectivity 50 %
  • Battery 100 %

Price comparison

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*Prices include shipping and toll. Intermediate changes of prices, ranking, delivery time and costs possible. Prices last updated on

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No issues with callers having to deal with extreme echo of their own voice? Have two K6s, and both have the same issue. Also the USB-C to 3.5 jack – adapter is kinda glitching. Otherwise a very nice phone for the price.


Jep i got the same. And now even worse. The speaker stops when i have a call. I can hear it ringing. Pick it up but cant hear them. Only when i press speaker. Very annoying