Product
Vivo V15 Pro
Vivo V15 Pro
Xiaomi Redmi K20
Xiaomi Redmi K20
Battery
Charging 18W wired, 24% in 15 min 18W wired
Type 3700 mAh, non-removable Li-Po 4000 mAh, non-removable
Body
Build Glass front, plastic back, plastic frame Glass front (Gorilla Glass 5), glass back (Gorilla Glass 5), aluminum frame
Dimensions 157.3 x 74.7 x 8.2 mm (6.19 x 2.94 x 0.32 in) 156.7 x 74.3 x 8.8 mm (6.17 x 2.93 x 0.35 in)
SIM Nano-SIM + Nano-SIM Nano-SIM + Nano-SIM
Weight 185 g (6.53 oz) 191 g (6.74 oz)
Comms
Bluetooth 5.0, A2DP, LE, EDR, aptX 5.0, A2DP, LE, aptX HD
NFC Yes (market dependent) Yes (China only)
Positioning GPS, GLONASS, BDS GPS, GLONASS, GALILEO, BDS
Radio FM radio FM radio
USB microUSB 2.0 USB Type-C 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
Protection - Corning Gorilla Glass 5
Resolution 1080 x 2340 pixels, 19.5:9 ratio (~404 ppi density) 1080 x 2340 pixels, 19.5:9 ratio (~403 ppi density)
Size 6.39 inches, 99.7 cm2 (~84.9% screen-to-body ratio) 6.39 inches, 100.2 cm2 (~86.1% screen-to-body ratio)
Type Super AMOLED Super AMOLED, HDR
Features
Sensors Fingerprint (under display, optical), accelerometer, gyro, proximity, compass Fingerprint (under display, optical), accelerometer, gyro, proximity, compass
Launch
Announced 2019, February. Released 2019, March 2019, May. Released 2019, June
Status Discontinued Discontinued
Main Camera
Features LED flash, HDR, panorama Dual-LED flash, HDR, panorama
Triple 48 MP, f/1.8, (wide), 1/2.0", 0.8µm, PDAF 8 MP, f/2.2, 13mm (ultrawide) 5 MP, f/2.4, (depth) 48 MP, f/1.8, 26mm (wide), 1/2.0", 0.8µm, PDAF 8 MP, f/2.4, 53mm (telephoto), 1/4.0", 1.12µm, PDAF, 2x optical zoom 13 MP, f/2.4, 12mm (ultrawide), 1/3.1", 1.12µm
Video 4K@30fps, 1080p@30/60fps 4K@30fps, 1080p@30/120/240fps, 1080p@960fps
Memory
Card slot microSDXC (dedicated slot) No
Internal 128GB 6GB RAM, 128GB 8GB RAM 64GB 6GB RAM, 128GB 6GB RAM, 256GB 8GB RAM
  eMMC 5.1 UFS 2.1
Misc
Colors Topaz Blue, Coral Red, Ruby Red Carbon black, Red flame, Glacier blue, Pearl White
Models 1818, vivo 1818 M1903F10I
SAR - 1.07 W/kg (head)     0.72 W/kg (body)    
Network
2G bands GSM 850 / 900 / 1800 / 1900 GSM 850 / 900 / 1800 / 1900
3G bands HSDPA 850 / 900 / 1900 / 2100 HSDPA 850 / 900 / 1900 / 2100
4G bands 1, 3, 5, 7, 8, 20 1, 3, 5, 7, 8, 34, 38, 39, 40, 41
Speed HSPA 42.2/5.76 Mbps, LTE (2CA) Cat12 600/50 Mbps HSPA, LTE
Technology GSM / HSPA / LTE GSM / HSPA / LTE
  1, 3, 5, 8, 38, 40, 41 - India -
Our Tests
Audio quality Noise -93.4dB / Crosstalk -92.2dB -
Battery (old) Endurance rating 92h -
Camera Photo / Video -
Display Contrast ratio: infinite, 3.806 (sunlight) -
Loudspeaker Voice 65dB / Noise 74dB / Ring 83dB -
Performance AnTuTu: 180774 (v7) GeekBench: 6527 (v4.4) GFXBench: 7.1fps (ES 3.1 onscreen) -
Platform
Chipset Qualcomm SDM675 Snapdragon 675 (11 nm) Qualcomm SDM730 Snapdragon 730 (8 nm)
CPU Octa-core (2x2.0 GHz Kryo 460 Gold & 6x1.7 GHz Kryo 460 Silver) Octa-core (2x2.2 GHz Kryo 470 Gold & 6x1.8 GHz Kryo 470 Silver)
GPU Adreno 612 Adreno 618
OS Android 9.0 (Pie), Funtouch 9 Android 9.0 (Pie), upgradable to Android 10, MIUI 12
Selfie camera
Features HDR HDR
Single Motorized pop-up 32 MP, f/2.0, 26mm (wide), 1/2.8", 0.8µm Motorized pop-up 20 MP, f/2.2, (wide), 1/3.4", 0.8µm
Video 1080p@30fps 1080p@30fps
Sound
3.5mm jack Yes Yes
Loudspeaker Yes Yes
  - 24-bit/192kHz Hi-Res audio