We have seen lot many phones in the category of bigger battery size lasting for atleast 3 to 4 days of up time and we also have phone withstanding extreme conditions. Some of the tech guys have done videos of few phones run over by a car. Making a cut as "Tougher + bigger on battery + anti-crash proof" phone is the Oukitel K4000 which was recently announced by the company.Oukitel K4000 Review

This phone from Oukitel is so hard that sudden drops will not do any hard to Oukitel K4000. Furthermore, company claims that it can crack more than 600 walnuts before screen breaks.OUKITEL K4000

Powered with 4000 mAh battery, you are bound to get 7 days of battery life or 3 days atleast on heavy usage.

Oukitel K4000 Specifications

Display: 5-inch 1280x720 touchscreen display
SoC:1.3 GHz Quad-Core MediaTek MT6592 processor
GPU: Adreno 302
Software: Android 5.1 Lollipop OS
Dual SIM: Yes
Main Camera: 8 MP rear camera with LED Flash
Front Camera: 2 MP front facing camera
Storage: 4 GB Internal + Micro SD card slot support up to 32 GB
Connectivity: 4G LTE, 3G HSPA, Bluetooth, WiFi tether, WiFi
Battery: 4000 mAh Li-ion battery
aGPS, FM Radio, 3.5 mm audio jack

Price, Availability

No word is currently said on Oukitel K4000 price tag. Definitely it will be sold in China only. Company also shared a video on how hard is the phone.