Keep the Mi Smart Band 4 charged so activity tracking, workouts, sleep monitoring, heart rate measurement, notifications, alarms, and syncing are not interrupted. Battery use varies with screen activity, vibration alerts, monitoring frequency, workouts, notifications, and Bluetooth syncing.
[reference] Title: Charging method Text: Remove the tracker body from the wristband and place it correctly in the dedicated charging cradle or compatible charging accessory. Title: Charging contacts Text: The metal contacts on the tracker and charger need to be aligned, clean, and dry. Title: Charging status Text: A battery or charging indicator on the band shows that the charging connection is active. Title: Daily battery use Text: Frequent screen use, vibrations, monitoring, workouts, notifications, and syncing can use more battery. [/reference]When to Charge
Charge the band when its battery level is low or when you expect to need uninterrupted tracking. You do not need to wait for the battery to become completely empty.
- Before overnight sleep tracking when the battery is low
- Before a long workout or extended tracking session
- Before traveling
- While resting, showering, or working at a desk
- During another period when you do not need activity tracking
If the battery becomes too low, the band may power off or stop recording activity, sleep, workouts, notifications, alarms, heart rate data, or other information until it is charged again.
Before Charging
Use the charging accessory intended for the Mi Smart Band 4 or a compatible replacement designed to hold its tracker securely. Chargers for other band models may look similar but may not fit or align correctly.
[checklist] * Mi Smart Band 4 tracker body is ready * Charging cable or cradle is compatible with the tracker * USB power source is available * Tracker and charger contacts are clean and dry * Charging surface is stable and dry * Soft dry cloth is available if the contacts need cleaning [/checklist] [warning] Do not force the tracker into an incompatible charger, and do not begin charging while the tracker or charging contacts are wet. [/warning]Remove the Tracker
The tracker body normally needs to be removed from the wristband before charging so its metal contacts can connect with the charging cradle.
[step] 1. Hold the wristband securely. 2. Turn the band so you can access the tracker body from the back. 3. Gently push one end of the tracker out of the wristband. 4. Once one end is free, carefully remove the rest of the tracker. 5. Keep the tracker and strap on a clean, stable surface while preparing the charger. [/step]Avoid twisting or bending the tracker aggressively. Do not use sharp metal tools to remove it, as they can scratch the tracker, damage the strap, or contact the charging area.
Check the Charging Contacts
Sweat, dust, lotion, soap residue, or other dirt around the metal contacts can interfere with the charging connection. Check both the tracker contacts and the contacts on the charger before connecting them.
- Wipe dirty contacts gently with a clean, dry, soft cloth.
- Make sure the contact area is fully dry.
- Avoid scratching the metal contacts with hard or sharp objects.
- Dry the tracker after exercise before placing it in the charger.
- Keep the charging cable and cradle dry.
Charge the Band
Correct positioning is important because the tracker contacts need to touch the charger contacts securely.
[step] 1. Remove the tracker body from the wristband. 2. Check that the tracker and charger contacts are clean and dry. 3. Place the tracker into the charging cradle with the contacts aligned. 4. Press it gently into position so it sits securely without being forced. 5. Connect the USB end of the charging cable to a suitable USB power source. 6. Check the band for a battery or charging indicator. 7. Leave the tracker connected until the battery level is sufficient for your planned use or charging is complete. [/step]
Check Charging Status
When the connection is correct, the screen should show a charging or battery indication. If the display is not currently visible, lightly touch the display or touch-button area to check the charging status.
- A battery or charging icon appears.
- Charging progress or battery level increases over time.
- The tracker remains securely seated in the cradle.
- The charging contacts remain aligned.
If no charging indication appears, disconnect the tracker, check the contact alignment and cleanliness, then seat it in the cradle again.
USB Power Sources
The Mi Smart Band 4 charging cable connects through USB. Use a stable, suitable USB power source and avoid damaged or unreliable charging equipment.
- USB wall adapter
- Computer USB port
- Laptop USB port
- Compatible power bank
- Reliable USB charging hub
If charging is slow or repeatedly interrupted, try another suitable USB source and check the charging cable and contact alignment.
Charging Time
The time needed to charge can vary with the starting battery level, power source, cable condition, and charging connection. Leave the tracker connected until the displayed battery level is sufficient for your next activity.
If you only need enough power for a planned activity, a partial charge may be sufficient. Avoid repeatedly removing and reconnecting the tracker while it is charging because this interrupts the charging process.
Charging Safety
[dosdonts] Do: Charge the band in a clean and dry location. Do: Keep the tracker and charger contacts clean and dry. Do: Place the charger on a stable surface. Do: Disconnect the tracker carefully when charging is complete. Do: Check the cable if it becomes loose or worn. Dont: Charge the tracker when it is wet. Dont: Charge near water or in very humid conditions. Dont: Use a damaged charging cable. Dont: Force the tracker into the charging cradle. Dont: Cover the tracker with thick fabric while charging. Dont: Leave the charger near extreme heat. [/dosdonts] [warning] A little warmth can occur during charging. If the tracker becomes unusually hot, disconnect it and let it cool before using or charging it again. [/warning]After Charging
Remove the tracker from the cradle carefully by holding it from the sides. Reinstall it in the wristband with the display facing outward and the heart-rate sensor facing inward toward your wrist.
[checklist] * Battery level is sufficient * Tracker has been removed carefully from the charger * Tracker is seated securely in the wristband * Tracker does not wobble in the strap * Display faces outward * Sensor side faces inward toward the wrist * Band is ready to wear * Data can be synced with the app if needed [/checklist]If the band had powered off because of a low battery, allow it to regain enough charge, then resume normal use and sync available data with the companion app if needed.
Basic Charging Checks
[troubleshoot] Problem: No charging indication appears Cause: The tracker may not be seated correctly, the contacts may be dirty, the USB source may not be supplying power, or the battery may be very low Fix: Reposition the tracker, clean and dry the contacts, try another suitable USB source, and leave the tracker connected for several minutes before checking again Problem: Charging appears slow Cause: The USB source may be weak or unstable, the contacts may be dirty, or the cable connection may be poor Fix: Check the contacts and cable connection, then try another suitable USB power source Problem: Charging stops when the tracker is moved Cause: The tracker may be sitting loosely in the charging cradle Fix: Reposition it so the charging contacts stay aligned and the tracker sits securely Problem: Charging cable or cradle feels loose Cause: The charging accessory may be worn or damaged Fix: Inspect the accessory and use a compatible replacement if it no longer holds the tracker securely Problem: Tracker becomes unusually warm Cause: Charging conditions, the power source, or the charging connection may be unsuitable Fix: Disconnect the tracker, allow it to cool, and check the charger, contacts, and charging environment before using it again [/troubleshoot]Extend Daily Battery Use
Battery life depends on how the Mi Smart Band 4 is configured and used. Features that activate the screen, vibration, sensors, workouts, or syncing more often can use additional power.
- Reduce screen brightness when a high setting is not needed.
- Disable unnecessary app notifications.
- Reduce automatic heart-rate monitoring frequency when appropriate for your use.
- Turn off lift-to-wake if you do not need it.
- Use Do Not Disturb when vibration alerts are unnecessary, such as at night.
- Avoid starting long workout tracking sessions when the battery is already very low.
- Keep the companion app current when updates are available.
Charging Habits
You do not need to wait for the Mi Smart Band 4 to become completely empty before connecting it to the charger. Charging before an important tracking period can reduce the chance of the band powering off while you are using it.
- Recharge when the battery level becomes low.
- Check the battery before overnight sleep tracking.
- Charge before long workouts or travel when needed.
- Keep the charging contacts clean and dry.
- Store the charging cable where its contacts and cable are protected from damage.
- Avoid wet or excessively hot charging locations.
Cleaning Before Charging
Exercise and daily wear can leave sweat or residue around the tracker. Before charging, wipe the contact area gently and make sure no moisture remains around the metal contacts.
Keep the charger itself dry. A water-resistant tracker should not be treated as an indication that its charging accessory can also be exposed to water.
Common Charging Mistakes
- Letting the battery run empty even when continuous tracking is still needed
- Connecting the tracker while its contacts are wet or dirty
- Using a damaged or poorly fitting charging accessory
- Forcing the tracker into the cradle in the wrong position
- Repeatedly removing and reconnecting the tracker during charging
- Charging in a very hot, wet, or unstable location
- Leaving the tracker loose in the wristband after charging