The device comes with a big 5,000 mAh battery that supports 18W fast battery charging to charge it very fast within 1 hour.
Being it a "mid-range" smartphone doesn't mean it's a low quality phone. As you can see, it comes with some high-end specs, including 64GB internal storage, a micro-SD card slot, as well as 4GB of RAM. There’s a dual camera at the back and a 16 megapixel selfie camera in front.
The Android version is 7.0 Nougat. Check below for the full specs.

ZTE NUBIA N3 SPECIFICATIONS AND PRICE
SUPPORTED NETWORKS2G: GSM, GPRS, EDGE 850 / 900 / 1800 / 1900 MHz
3G: UMTS, WCDMA, HSDPA 850 / 900 / 1900 / 2100 MHz
4G: LTE unspecified frequency bands
SIM Type:
PLATFORM
OS: Android 7.1 Nougat
DESIGN
Dimensions: mm
Weight: g
Display: 5.99 inches, 2,160×1,080 pixels, 18:9 ratio, IPS LCD display
Sensors: Fingerprint, Accelerometre, Proximity
Build:
Colours: Obsidian Black. Space Gold. Nebula Red
HARDWARE
Processor Type: 64-bit
Processor Name: Qualcomm Snapdragon 625
Graphics Processor: Adreno™ 506
MEMORY
RAM: 4GB
Internal Storage: 64GB
External Storage: microSD
CAMERAS
Rear: Dual, auto-focus, LED flash
Video recording: 1080 @ 30fps
Front-facing: 16 megapixels
MULTIMEDIA
Music Support: MP3/WAV/eAAC+ player
Audio:
Loudspeaker: Mono
Video Support: MP4/MPEG4/H.263/H.264 player
FM Radio:
CONNECTIVITY
Bluetooth: v4.2
WiFi: Wi-Fi 802.11 b/g/n, hotspot
GPS: Yes
USB: microUSB v2.0
MISC
Charging: 18W Fast Battery Charging
Battery Type and Capacity: Lithium-Ion 5000mAh
Announced: March 9, 2018
Availability: March 24, 2018
Smartphone Price: To be announced.