Product
Vivo Z1i
Vivo Z1i
Xiaomi Redmi Note 4 (MediaTek)
Xiaomi Redmi Note 4 (MediaTek)
Battery
Type Li-Ion 3260 mAh, non-removable Li-Po 4100 mAh, non-removable
Body
Build Glass front, plastic back, plastic frame Glass front, aluminum back, aluminum frame
Dimensions 154.8 x 75 x 7.9 mm (6.09 x 2.95 x 0.31 in) 151 x 76 x 8.4 mm (5.94 x 2.99 x 0.33 in)
SIM Nano-SIM + Nano-SIM Nano-SIM + Micro-SIM
Weight 149.3 g (5.26 oz) 175 g (6.17 oz)
Comms
Bluetooth 5.0, A2DP, LE 4.2, A2DP, LE
Infrared port - Yes
NFC No No
Positioning GPS, GLONASS, BDS GPS, GLONASS, BDS
Radio FM radio FM radio
USB microUSB 2.0, OTG microUSB 2.0, OTG
WLAN Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct
Display
Resolution 1080 x 2280 pixels, 19:9 ratio (~403 ppi density) 1080 x 1920 pixels, 16:9 ratio (~401 ppi density)
Size 6.26 inches, 97.8 cm2 (~84.2% screen-to-body ratio) 5.5 inches, 83.4 cm2 (~72.7% screen-to-body ratio)
Type IPS LCD IPS LCD
Features
Sensors Fingerprint (rear-mounted), accelerometer, proximity, compass Fingerprint (rear-mounted), accelerometer, gyro, proximity, compass
Launch
Announced 2018, July. Released 2018, July 2016, August. Released 2016, August
Status Discontinued Discontinued
Main Camera
Dual 13 MP, f/2.2, PDAF 2 MP, (depth) -
Features LED flash, HDR, panorama Dual-LED dual-tone flash, HDR, panorama
Single - 13 MP, f/2.0, PDAF
Video 4K@30fps, 1080p@30fps 1080p@30fps, 720p@120fps
Memory
Card slot microSDXC (uses shared SIM slot) microSDXC (uses shared SIM slot)
Internal 128GB 4GB RAM, 128GB 8GB RAM 16GB 2GB RAM (Standard), 64GB 3GB RAM (High), 64GB 4GB RAM (Exclusive)
  eMMC 5.1 -
Misc
Colors Black, Red Silver, Gray, Gold, Blue, Black
Models V1730DA, V1730DT -
Network
2G bands GSM 850 / 900 / 1800 / 1900 GSM 900 / 1800 / 1900 - SIM 1 & SIM 2
3G bands HSDPA 850 / 900 / 1700(AWS) / 2100 HSDPA 850 / 900 / 1900 / 2100
4G bands 1, 3, 4, 5, 8, 39, 40, 41 1, 3, 5, 7, 8, 38, 39, 40, 41
Speed HSPA 42.2/5.76 Mbps, LTE (2CA) Cat6 300/50 Mbps HSPA, LTE
Technology GSM / CDMA / HSPA / LTE GSM / CDMA / HSPA / LTE
  CDMA 800 & TD-SCDMA CDMA 800 & TD-SCDMA
Our Tests
Battery (old) - Endurance rating 83h
Camera - Photo / Video
Display - Contrast ratio: 1158 (nominal), 2.145 (sunlight)
Loudspeaker - Voice 64dB / Noise 67dB / Ring 76dB
Performance - Basemark OS II 2.0: 1728Basemark X: 13666
Platform
Chipset Qualcomm SDM636 Snapdragon 636 (14 nm) Mediatek MT6797 Helio X20 (20 nm)
CPU Octa-core (4x1.8 GHz Kryo 260 Gold & 4x1.6 GHz Kryo 260 Silver) Deca-core 2.1 GHz
GPU Adreno 509 Mali-T880 MP4
OS Android 8.1 (Oreo), Funtouch 4 Android 6.0 (Marshmallow), MIUI 10
Selfie camera
Single 16 MP, f/2.0, 26mm (wide), 1/3.06", 1.0µm 5 MP, f/2.0
Video 1080p@30fps 720p
Sound
3.5mm jack Yes Yes
Loudspeaker Yes Yes
  - 24-bit/192kHz audio