[Device Reviews and Information] Alberto96:
Review (part 1)

Introduction

This is the OUKITEL K8000.

Hardware

Part of the K-series of battery phones released by OUKITEL, this K8000 is a whole new model, not a successor to another device released in the past, coming with a 5.5" HD AMOLED screen, the first time ever for OUKITEL, and an huge 8000mAh battery. All other specs are pretty standard, Mediatek MT6750T, 4GB of RAM and 64GB of Storage.

Unboxing

Almost identical to the K5000 package, this K8000 comes with the usual rich pack of accessories: 1x Micro-USB Cable, 1x Pump Express (up to 9V) USB Charger, 1x User Manual, 1x SIM Card Removal Tool, 1x Warranty Certificate, 1x OTG Cable, 1x TPU Cover and the Smartphone (of course). A screen protector is already applied.

It's been a long while since the last time OUKITEL released a full-body metal chassis for a device. The last one that featured it was the unlucky U15s. As a result of this choice, the device feels really solid, probably one the best one i have ever reviewed, and the build quality is decent with metal keys and no noticeable imperfections except some minor scratches on the antenna bands.

Due to the huge battery and metal chassis, this isn't a device that can be considered compact neither light. It is 15.5x7.62x1.10cm with a weight of 236g, not the heaviest battery phone i have ever tested, but it isn't light either.

Starting from the front side, OUKITEL declares to be using a "Dragontrail" glass, and it is 2.5D curved on the borders. Underneath, there is the AMOLED panel; the upper front side of the device features a Front-Facing Camera, an Earpiece, and the Sensors hole that includes Light and Proximity Sensors. A Notification LED is here.

Here you can see the LED in action. It seems to be an RGB variant.

Just like most devices released in the past few months, also this one features a fingerprint scanner on the lower front side while keeping lots of empty unused space on the sides where hardware touch keys would have been fitted without any issue.

There isn't much to say about the back side since, as already mentioned before, it features an unibody metal body thus it is only one piece for everything, no plastic parts.

The upper rear side of the device features the Camera Sensor with a Dual-LED Single-Tone Flashlight on the right.

On the lower rear side there isn't anything important at all since the speaker is located on the bottom.

Device

Screen

I am not a big fan of AMOLEDs, even though my daily driver Mi Note 2 features an OLED screen, but the panel on this device doesn't look extremely saturated. Colors are rich, and there is no "gummy" effect meaning that it has been mounted properly and not inverted. Due to the HD-only resolution, it doesn't look really sharp.

No issues detected with the Light Sensor. The panel does seem to lack some brightness, maybe limited via software for power consumption. AMOLEDs are usually brighter.

Viewing Angles are perfect, as you would expect from an AMOLED panel.

Camera

This device comes with a OnSemi AR1335 13MP camera sensor for the back camera that provides some decent shots and an overall acceptable picture quality. Colors look slightly washed out though, as you can notice on some samples attached below. Considering the type of smartphone, it is pretty common for companies to not focus a lot on camera quality for battery phones.

As regards the Flashlight, it is pretty powerful but slightly out-of-sync. Hopefully this will be fixed with an OTA Update.

When it comes to Video Recording the situation gets a bit worse, since videos are recorded at 1080p15 with heavy stuttering and unstable framerate. This is a clear confirm that the camera software requires lot of work.

The front-camera sensor is an high-quality OmniVision OV8856 8MP camera sensor that offers some decent shots. As you can notice, its angle is so wide that it is hard to get something focused for testing.

Audio

This is another department where the K8000 lacks some quality. Starting from the Earpiece, it is decent but there is some distortion at maximum volume and no low frequencies at all. The Speaker instead lacks some volume, and the range of frequencies is limited just like on most devices.

Something that doesn't lack quality is the Microphone, since it provides a pretty clear sound and everyone was able to hear me properly.

GPS

GPS Quality is so and so, the antenna isn't able to provide a really strong signal thus the amount of satellites isn't really high. Accuracy is just fine though, even indoors.

Indoors on the left, outdoors on the right.

Telephony, Mobile Network & WiFi

The device is meant to be used with European Networks (Band 20 included), just like most Chinese devices that are sold with EU Plug chargers. As regards the signal, i was not able to find any issue or lack of network connection, and the speed test run on 4G confirms it. The result is as good as it should be since that's the maximum i reach even with other devices.

Matching MT6750T tech. specs, it supports WiFi N 5GHz networks. Both signal and speed are excellent, able to use completely my internet bandwidth. An high quality antenna has been used.

Battery Life

Do not consider this battery capacity test as 100% accurate because the device never stopped charging even at 100%, keeping a really low load (0.09mA) from the charger. Based on this testing, the real battery capacity should be OK, matching the declared value.

Nothing to complain about the battery life. The PCMark Battery Test provided a result of 21h and 3m that, considering the power-hungry chipset (MT6750T), is as good as it should have been.

A 8000mAh battery can't be recharged so easily, and the Mediatek Pump Express charger (up to 9V) included with the device appears to be enough to provide some reasonable charging times, more or less 3 hours for a full charge.

Software

Thankfully, OUKITEL keeps using a clean OS for all new devices. It runs on Android 7.0 Nougat with the usual Mediatek old-style apps, and there is no bloatware excect a custom keyboard that can be easily disabled. It is a pity that it hasn't been released with Android 8 Oreo, but, considering OUKITEL's attitude, it is highly possible that it will be upgraded in the near future.

The only customization that i was able to find is a power-saving skin option in the battery tab, that simply replaces all white backgrounds for maximum power-saving, a must for AMOLED screens.

All Mediatek Goodies such as MiraVision, Gestures (double-tap to unlock included) and others are included.

Both Gyroscope and Magnetometer/Compass are present, thanks OUKITEL.

No malwares detected with Malware-Bytes Anti-Malware using latest definitions.

The fingerprint scanner used on this K8000 isn't the best i have ever tested, it lacks some accuracy for some reason. It is fast enough, but frequently not able to recognize my finger properly (as you can notice in the video). Looking forward to see some improvements with an OTA Update.

[YOUTUBE]MR3HVL-z7gY[/YOUTUBE]​