The Xiaomi Mi Band 4 fitness bracelet remains one of the most popular gadgets for tracking activity, despite the release of new models. Its main advantages are compactness, sensor accuracy and long run time from a single charge (up to 20 days in standby mode). But even such a hardy device sooner or later requires connection to a charger.
In this article, we'll look at not only standard charging times, but also the nuances that affect the process, from the type of charger to the ambient temperature, how to recognize a full charge from the on-screen indicators, why the bracelet can charge longer than usual, and what to do if it does not respond at all to the connection to the network, and also practical tips for extending the battery life to help avoid frequent recharging.
The standard charging time of the Mi Band 4: what depends on?
Xiaomi says that the full charge of the Mi Band 4 takes about 2 hours, but in practice this time can vary from 1 to 2.5 hours depending on several factors:
- 🔋 Battery discharge level: if the bracelet is completely dead (0%), charging will take the maximum time.
- ⚡ Type of charger: original cable from Xiaomi provides optimal current.Using uncertified adapters can increase charging time or even damage the battery.
- 🌡️ Ambient temperature: at low temperatures (below) +10°C) Lithium polymer batteries charge more slowly. In the heat (above) +35°C) the risk of overheating increases.
- 📱 Firmware version: In rare cases, older versions of software may contain bugs that affect power management.
It is important to understand that the Mi Band 4 uses a lithium polymer battery with a capacity of 135 mAh. Despite modest figures, this is enough for 5-7 days of active use (with notifications, pulse monitor and screen backlight) or up to 20 days in standby mode. The first charge after purchase can take a little longer - this is normal, since the battery "swings" after long storage.
How do you know if the Mi Band 4 is fully charged?
Unlike smartphones, the Mi Band 4 does not have an audible warning when it completes charging, but you can recognize 100% charge by three key features:
- On-screen indicator: When you connect to charging, the battery icon shows up on the display with an animation of the filling, and when the process is complete, the indicator shows 100% and stops flashing.
- LED on charger: The original cable has a small red light, which burns when it's charged, and then goes out when it's finished.
- Disconnection from the network: if the bracelet does not respond to touch and does not show signs of charging, but the screen turns on when pressed - most likely, it is already charged.
If in doubt, check the charge level through the Mi Fit app (Profile → Mi Band 4 → Battery status). Sometimes due to synchronization failures, the bracelet may show irrelevant data, in which case a reboot will help (hold the touch button for 10 seconds).
💡
Don’t leave the Mi Band 4 on charge for more than 3-4 hours after reaching 100%.Constantly maintaining maximum charge reduces the life of lithium polymer batteries.
Why does the Mi Band 4 charge longer than usual?
If your bracelet is charging for more than 3 hours, it is a reason to pay attention to possible problems, and here are the most common causes and ways to fix them:
| Reason. | Signs. | Decision |
|---|---|---|
| Unoriginal cable | Slow charging, overheating. | Use only Xiaomi’s proprietary cable with a magnetic connector |
| Contaminated contacts | Intermittent charging, connection errors | Clean the contacts of the bracelet and cable with an alcohol napkin |
| Old firmware. | Charging is "hanging" by 99% | Update the software via Mi Fit (Device Profile Section → Firmware Update) |
| Battery wear and tear | Fast discharge, charging for more than 4 hours | Contact the service center to replace the battery |
Special attention should be paid to the bracelet overheating during charging. If the case becomes hot (above +40 ° C), immediately disconnect it from the network.
- 🔥 Use of a powerful adapter (more) 5V/1A)
- 🛠️ Battery damage (blown, electrolyte leakage)
- ☀️ Charging under direct sunlight
What if the Mi Band 4 doesn’t charge at all?
Can I use the Mi Band 4 while charging?
Technically, the Mi Band 4 continues to work while charging, displaying time, notifications and even counting steps, but the manufacturer does not recommend actively using the device during this period for several reasons:
⚠️ Attention: Using the bracelet while charging increases the load on the power controller, which can cause the chips to overheat, especially if you run energy-intensive functions (for example, continuous pulse measurement).
What can and cannot be done:
- ✅ Check the charge level on the screen
- ✅ Respond to notifications (briefly)
- ❌ Start training with GPS (if connected to a smartphone)
- ❌ Update the firmware through Mi Fit
If you need to monitor activity while charging (e.g., in competitions), use aerial mode (Settings → Flight Mode) to turn off power-intensive functions like Bluetooth and notifications, reducing battery load.
How to extend the battery life of Mi Band 4?
Lithium polymer batteries degrade over time, but proper operation can increase their lifespan by 30-50%.
Connect to charging at 10-20 level%|Shut off the network immediately after 100%|Use only the original cable.|Avoid charging at temperatures below +5°C and above. +30°C|Keep the bracelet at 40-60% charge if you don’t use it for a long time-->
One of the most pernicious myths is that you have to completely drain the battery before charging. For today's lithium polymer batteries, it's not just useless, it's also harmful!
- 🔄 Partial cycles: charge the bracelet at 10-20% and turn off 80-90% (unless you need maximum autonomy).
- 🌙 Night charging: If you put on charging before bedtime, use the socket timer to turn off power after 2 hours.
- 📵 Disabling unnecessary functions: a permanent pulse monitor and notifications from social networks reduce the time of operation by 30-40%.
The average battery life of the Mi Band 4 is 300-500 full charge cycles. With daily use, this is about 2-3 years. After that, the capacity begins to fall noticeably (the bracelet discharges in 1-2 days), in which case only replacing the battery in the service center will help.
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The ideal charge level for storing the bracelet is 40-60%. If you do not plan to use the device for more than a month, discharge / charge it to this range.
Frequent errors users when charging Mi Band 4
Even experienced owners of smart bracelets sometimes make mistakes that shorten the life of the battery or disable the device.-5 most common slip-ups:
- Using "fast" chargers from smartphones (such as Quick Charge or VOOC) they deliver currents above 1A, which can damage the power controller of the bracelet.
- Charging through USB-Low-current port of a computer (less than 0.5A) not only increases charging time, but can cause battery failures.
- Keeping the bracelet discharged (0%) for longer than a week, and a deep discharge leads to irreversible loss of capacity.
- Ignoring firmware updates: Newer versions often optimize power management algorithms.
- Cleaning contacts with abrasive materials (sandpaper, metal objects) damages the protective coating and worsens contact.
Another common mistake is to try to charge the bracelet through powerbank without stabilizing the current. Many external batteries give out unstable voltage, which can lead to malfunctions in the Mi Band 4. If there is no alternative, use a quality powerbank with stabilization support (for example, from Xiaomi or Anker).
⚠️ Warning: If the bracelet shows 100% after charging, but discharges in a few hours - this is a sign of battery wear or calibration failure. → Reset) or contact the service.