Redmi Band 4 vs Band 2 specs comparison
The Band 4 has a bigger battery, more sports modes, newer software and a slightly more polished design. Interestingly, the screen size and resolution haven't changed, so don't expect a major visual improvement. Both cover the everyday health tracking basics, but the Band 4 is the more rounded package. If your Band 2 is still working perfectly, there's no urgency to replace it, although the newer model is a sensible upgrade at this price.
Full comparison
The full record
77 specifications across 6 areas, with 14 genuine differences.
1. Design & display No clear edge
Fact
Redmi Band 4
Redmi Band 2
Release date
2026-10-20
2022-12-27
Physical size
43.5 × 25.8 × 10.2 mm
42.81 x 25.42 x 9.99 mm
Weight
18 g without strap
14.9 g without strap
Material
Metal-look middle frame; textured strap
Polycarbonate body; TPU strap
Water resistance
5 ATM
5 ATM
Color options
Black, Silver
Ivory, Olive, Snazzy Green, Blue, Black, Pink
Display type
TFT LCD
TFT LCD
Display size
1.47 inch
1.47 inch
Display resolution
172 x 320 pixels, 247 ppi
172 x 320 pixels, 247 ppi
Display brightness
Up to 450 nits
Up to 450 nits
Display protection
2.5D curved cover glass
Tempered glass with anti-fingerprint coating; 2.5D micro-curved glass
2. Battery & charging Redmi Band 4
Fact
Redmi Band 4
Redmi Band 2
Battery
Rechargeable battery; 300 mAh
Rechargeable battery; 210 mAh
Battery life
Up to 21 days (light use); around 8 days (regular monitoring)
Up to 14 days typical use; 6 days heavy use
Charging
Magnetic charging
Magnetic charging
Charging time
Under 2 hours
Less than 120 minutes
3. Sensors & positioning No clear edge
Fact
Redmi Band 4
Redmi Band 2
GNSS type
None
None
GPS
No
No
GALILEO
No
No
GLONASS
No
No
QZSS
No
No
Beidou
No
No
Accelerometer
Yes
Yes
Gyroscope
Yes
No
Barometric altimeter
No
No
Compass
No
No
Geomagnetic
No
No
Ambient light sensor
No
No
Optical heart rate
Yes
Yes
Electrical heart rate
No
No
SpO2
Yes
Yes
Temperature
No
No
Galvanic skin response
No
No
Microphone
No
No
Speakers
No
No
Vibration motor
Yes
Yes
4. Health & activity Even
Fact
Redmi Band 4
Redmi Band 2
Steps
Yes
Yes
Distance
Yes
Yes
Calories burned
Yes
Yes
Floors
No
No
Sports tracking
Yes (50 sports modes)
Yes (30+ sports modes)
Sleep
Yes
Yes
Heart rate
Yes
Yes
HRV
No
No
Stress
Yes
Yes
Blood oxygen
Yes
Yes
Respiration rate
No
No
Skin temperature
No
No
ECG
No
No
Blood pressure
No
No
Body composition
No
No
Glucose
No
No
Hydration level
No
No
UV exposure
No
No
Calorie intake
No
No
Hyperglycemia risk assessment
No
No
Arterial stiffness detection
No
No
Pulse wave arrhythmia analysis
No
No
No significant differences in this area.
5. Smart features No clear edge
Fact
Redmi Band 4
Redmi Band 2
Smartphone compatibility
Android 8.0+ and iOS 12.0+
Android 6.0+ and iOS 12.0+
Operating system at launch
Xiaomi HyperOS
Proprietary
Bluetooth
Yes (5.3)
Yes (5.1)
Wi-Fi
No
No
NFC / connected pay
Yes (China; offline WeChat/Alipay payments)
No
UWB
No
No
Cellular
No
No
Smartphone notifications
Yes
Yes
Bluetooth calling
No
No
Smartphone music control
Yes
Yes
On-board music storage
No
No
Voice assistant
No
No
6. Navigation & safety Even
Fact
Redmi Band 4
Redmi Band 2
Maps
No
No
Offline maps
No
No
Navigation
No
No
Emergency SOS
No
No
Satellite SOS
No
No
Fall detection
No
No
LED flashlight
No
No
Diving
No
No
No significant differences in this area.