Full specifications, features and battery life for the Xiaomi Smart Band 9, Xiaomi’s aluminium-framed fitness band with a 1.62in AMOLED screen, now succeeded by Smart Band 10.
| Manufacturer | Xiaomi |
| Type | Fitness band, no built-in GPS |
| Series | Smart Band |
| Predecessor | Xiaomi Smart Band 8 |
| Successor | Xiaomi Smart Band 10 |
| Dimensions | 46.53 x 21.63 x 10.95mm |
| Weight | 15.8g, excluding strap |
Specifications and features as at launch.
Expert opinion | Specifications | Battery life | Features | Further reading
Expert opinion
Smart Band 9 tracks VO2 max, training load, recovery time and training results across more than 150 sports modes. Ten on-wrist running courses, from run/walk to aerobic endurance, give newer runners structured sessions. An optional running clip, sold separately and worn on the shoe, adds 13 running metrics including cadence, stride length and ground contact time. Sleep tracking records sleep stages with overnight heart rate and blood oxygen, and adds Sleep Animal analysis and daily tips. All-day heart rate, blood oxygen and stress monitoring run alongside menstrual cycle prediction. Xiaomi claims up to 21 days of battery life in typical use and 9 days with the always-on display. The band has no built-in GPS, and Xiaomi lists no ANT+ support or heart rate broadcast. Smart Band 10 replaces it with a larger, brighter screen, heart rate broadcast and an improved swim mode with real-time heart rate. Smart Band 9 suits parkrunners, gym members and walkers who want long battery life and basic training metrics in a light band.
Specifications
| Display | |
|---|---|
| Type | AMOLED touch display |
| Size | 1.62in |
| Resolution | 192 x 490px |
| Brightness | Up to 1,200 nits, auto brightness |
| Refresh rate | 60Hz, varies by interface |
| Physical | |
| Dimensions | 46.53 x 21.63 x 10.95mm, excluding strap and protrusions |
| Weight | 15.8g, excluding strap |
| Case material | Aluminium frame |
| Strap | TPU, quick-release, fits 135 to 210mm wrists |
| Water resistance | 5 ATM / 50m, TUV SUD certified |
| Colours | Midnight Black, Glacier Silver, Mystic Rose, Arctic Blue, Titan Gray |
| Sensors and positioning | |
| Positioning | No built-in GPS |
| Optical heart rate | Optical heart rate sensor |
| Other sensors | Accelerometer, gyroscope, ambient light sensor |
| © the5krunner. Link required. | |
| Connectivity and battery | |
| Haptics | Linear motor |
| Battery | 233mAh |
| Battery, typical use | Up to 21 days claimed |
| Battery, always-on display | Up to 9 days claimed |
| Battery, heavy use | Up to 6.6 days claimed |
| Charging | Magnetic, approximately 1 hour for a full charge |
| Compatibility | Android 8.0 and above, iOS 12.0 and above |
Battery life
Xiaomi claims up to 21 days in typical use from the 233mAh battery. That test checks heart rate every 30 minutes and leaves high-precision sleep, stress and blood oxygen monitoring switched off. The always-on display cuts the claim to 9 days. Under heavy use, with stress and blood oxygen monitoring on and heart rate checked every minute, Xiaomi claims 6.6 days. Anyone who wants the full sleep and health data should expect a weekly charge, which takes about an hour.
Features
Full feature detail is covered on the Xiaomi specifications index.
Sport and training
- More than 150 sports modes cover running, cycling, gym work and more.
- VO2 max, recovery time, training load and training results show how hard you have trained and how much rest you need.
- Ten on-wrist running courses, from run/walk to aerobic endurance, guide each session.
- An optional running clip, sold separately and worn on the shoe, tracks 13 running metrics including cadence, stride length and ground contact time.
- A vitality score rates your moderate to vigorous activity over seven days out of 100.
- Water resistance of 5 ATM covers pool and shallow-water use.
Health and recovery
- All-day heart rate monitoring includes high and low heart rate alerts, and smart monitoring can check as often as once a minute.
- Xiaomi claims heart rate accuracy is 16% better than Smart Band 8.
- All-day blood oxygen monitoring can warn of low readings.
- All-day stress monitoring prompts you to relax, with breathing training to help.
- Sleep tracking records sleep stages with heart rate and blood oxygen overnight, monitors longer-term sleep cycles, and adds Sleep Animal analysis and daily sleep tips.
- Women’s health tracking predicts menstrual cycles.
Smart features
- A linear motor with 20 vibration modes makes alerts easy to feel.
- Widgets include alarms, weather, focus mode, to-do list, timer, stopwatch, flashlight, world clock and find phone.
- Music and camera control work with some phones, and event alerts need a Xiaomi or Redmi phone.
- More than 200 watch faces include photo faces.
- Quick-release straps make it easy to change the look, and straps from Smart Band 8 fit.
- Pendant mode lets you wear the band as jewellery, although heart rate, blood oxygen and sports functions are unavailable in that mode.
- Wet-screen protection reduces accidental touches when the screen is wet.
Compatibility
- The band pairs through the Mi Fitness app with Android 8.0 and above or iOS 12.0 and above.
Further reading
- Xiaomi specifications index
- Xiaomi Smart Band 10 specifications
- Xiaomi Smart Band 9 Pro specifications
- Xiaomi Smart Band 9 Active specifications
- Sports watch specifications
Small things I always use
- Garmin 90-degree charging adapter: Charges your Garmin from any USB-C cable. Essential when travelling. I use one.
- Body Glide: The blue anti-chafe stick swimmers and runners carry. I use it.
- Speedo earplugs: Fewer ear infections and no cold-water dizziness. I use them.
- Dryrobe Advance: My winter changing robe for open-water swims. I use one. A cheaper option is the AONYIYI changing robe.
- Maurten: Race fuel that stays easy on the stomach. I use them.
- Beet It Sport nitrate shots: Beetroot shots I take in the days before a race. I use them.
- Garmin charging puck: The quickest way to top up before a session. I use one.
- Injinji: Toe socks that stop rubbing, so you run more. I use them.
- Ultimate toe protectors: Stop black toenails on long runs. They work. I use them.
- Compressport R2 v2 calf sleeves: My calf sleeves of choice. I use them.
- Cellucor C4: My pre-workout before hard sessions.
- TPU tubes: Schwalbe Aerothan, Tubolito and Pirelli SmarTube. Light, tiny spares. I use all three.
- G8 insoles: Adjustable insoles that are good. I use them.
- Cycplus Cube: A 97g electric pump that gets a road tyre rideable in two minutes. I carry one. 5% off with code THE5KRUNNER.
Watches and sensors
- Polar H10: My daily driver for waking HRV.
- Polar Verity Sense: My backup arm-worn HR sensor.
- Nomad bedside charger: Charges my iPhone and Apple Watch overnight. I use it, and many of their bands.
- Train.Red: The best muscle oxygen sensor I’ve used.
- Tymewear: Accurate heart rate and reliable ventilatory zones. I use it to pace endurance rides over an hour.
- Garmin Forerunner 970: A pro-grade triathlon watch. I use this.
- Apple Watch Ultra 4: My daily smartwatch. No phone needed on rides.
- Garmin Fenix 9 Pro: I’ve just bought one.
On the bike
- Continental GP5000 for everyday riding, and Aero 111 on the front for special occasions.
- Helmets: Specialized S-Works Evade 3 for road riding, and Rudy Project Wing for TT-style races. I use both.
- Ravemen FR300: A front light that mounts under your Garmin or Wahoo. I use one.
- Wahoo TRACKR Radar: I use it on one bike and Varia on the other. They perform the same.
- Garmin Varia RTL515: Radar that warns you of cars from behind. I use this model.
- Wahoo ELEMNT Roam 3: The bike computer that’s easy to use. I use mine on most rides.
- Favero Assioma Pro RS2: Accurate power pedals that swap easily between bikes. I use this model.
Home and indoor training
- NPE Runn: Makes my basic treadmill smart, sending more accurate speed and distance to my watch and Zwift. I use it.
- Google Wifi: Keeps Zwift connected in my pain cave. I use it.
- Apple TV 4K: Zwift on the big screen. I use two.
- Google Nest Doorbell (wired, 2nd gen): My video doorbell, running in both Google Home and Apple Home. I use it.
Health, recovery and sleep
- FreeStyle Libre 3 Plus: Shows how my blood sugar responds to diet.
- hDrop: Measures my sweat loss in summer and indoors.
- Fourth Frontier Zone: Checks my heart under load in hard sessions.
- Oura Ring 5: My partner’s recovery tracker of choice.
- Eight Sleep: A cooling mattress cover my partner and I use nightly.
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