Xiaomi Mi Band 4 is one of the most popular fitness bracelets on the market, combining accessibility, functionality and stylish design. However, even such a simple device has nuances in operation, especially when it comes to charging. Mishandling the battery can shorten its life or even make it out of order. In this article, we will break down everything you need to know about charging the Mi Band 4: from choosing a charger to extending the battery life.
Many users are faced with questions such as how long it takes to fully charge, whether you can use a non-original cable, why the bracelet does not charge or discharge quickly? The answers to these and other questions you will find below, and we will also reveal a few hidden chips that will help optimize the charging process and avoid typical errors.
Completement and original charger
In the box with Xiaomi Mi Band 4, you will find not only the bracelet itself, but also a special charger, which is a small module with magnetic contacts that are securely fixed on the back of the bracelet. It is important to understand that this is not just a cable, but a unique adapter that is compatible only with Mi Band 3/4/5 models (but not with newer or older versions).
The original charger has the following characteristics:
- 🔌 Type of connector: USB-A (plug-in).
- 🔋 Exit voltage: 5V/1A (standard USB-device).
- 🧲 Magnetic fixation: Contacts are automatically attracted to the bracelet, eliminating improper connection.
- 📏 Cable length: about 20 cm (convenient to connect to a power bank or laptop).
If you lose the original charger, don't rush to buy the first one on the market. Cheap analogs can not only slowly charge the bracelet, but also damage the battery due to unstable voltage. Target certified accessories from Xiaomi or proven manufacturers such as Baseus or Remax.
Next Next post: How to Charge Mi Band 4
The process of charging the bracelet is simple, but requires care. Follow this instruction to avoid errors:
- Remove the capsule from the strap. Carefully pull the bracelet towards the screen to separate the electronic module from the silicone strap, which is necessary, since the charging contacts are on the back of the capsule.
- Connect the charger. Connect the magnetic charging contacts to the corresponding metal pads on the bracelet, and you hear a slight click, which means that the connection is correctly installed.
- Put it on the power source. USB-charging-connector in the power adapter (5V/1A), A computer or power bank will display a charge indicator (battery icon) on the bracelet screen).
- Wait until it's fully charged. It depends on the discharge level, but it takes 1.5 to 2 hours on average. Don't interrupt the process if the bracelet isn't 100% charged.
If the charging indicator does not appear after connection:
- ❌ Check if the magnetic contacts are tightly attached.
- ❌ Try another one. USB-port.
- ❌ Clean the contacts on the bracelet and charge from dust or moisture (use a dry cotton swab).
Contacts on the bracelet and charging clean|Original or certified cable is used|USB-Port is good (try another one)|The bracelet is properly removed from the strap-->
Once fully charged, disconnect the bracelet from power and return the capsule to the strap. Avoid recharging - although there is protection against this in the Mi Band 4, the extra stress on the battery reduces its life.
How long does the Xiaomi Mi Band 4 charge?
Charging time depends on several factors: battery discharge level, type of charger and even ambient temperature. The table below shows the average values for the original charger:
| Charge level when connected | Time to 100% | Notes |
|---|---|---|
| 0–10% | 1 hour 40 minutes - 2 hours | Maximum time as the controller limits the current at the initial stage. |
| 20–50% | 1 hour - 1 hour 20 minutes | The optimal range for fast charging. |
| 50–80% | 30-40 minutes | Charging is faster, but the last 20% takes longer. |
| 80–100% | 20-30 minutes | The controller reduces the current to protect the battery. |
If you use a non-original charge, the time can increase by 30-50%, and the speed can also be affected by:
- 🔥 Temperature: when charging in the cold (below) +10°C) or heat (above) +35°C) the process is slowing down.
- 💻 Power supply: charging from a computer (USB 2.0) is slower than the network adapter.
- 🔋 Battery status: After 300-500 charging cycles, battery capacity decreases and time increases.
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If the bracelet is charging too long (more than 3 hours), check the cable for damage or try another power source. USB-port.
Frequent charging errors and how to avoid them
Many users unconsciously make mistakes that shorten the battery life of the Mi Band 4, the most common of which are:
⚠️ Warning: Never charge the bracelet in high humidity (such as immediately after a shower or pool) Contacts must be completely dry, otherwise the risk of corrosion or short circuit increases significantly.
Error 1: Using uncertified chargers
Cheap analogues can give off unstable voltages, which leads to overheating of the battery.
- 🔥 The bracelet gets very hot during charging.
- ⚡ The charge is jerky (fast, then slow).
- 🔋 After switching off, the charge level drops by 10-20% in a few minutes.
Error 2: Charging up to 100% and storing in this state
Lithium polymer batteries (which are installed in the Mi Band 4) do not like a long stay on 100% charge. Unless you plan to use the bracelet for a few days, the optimal level for storage is 40-60%, which will extend the battery life by 20-30%.
Error 3: Breaking the charge in half
Regular interruptions (e.g. when the bracelet is 50% charged and you turn it off) lead to a “memory effect” – the battery “remembers” an incomplete cycle and loses capacity. Try to charge the bracelet fully at least once every 2-3 weeks.
What to do if the bracelet is not charged at all?
How to extend the battery life?
The Xiaomi Mi Band 4 battery is designed for 300-500 full charge cycles, after which its capacity begins to decline markedly, but if used correctly, this figure can be increased by 20-30%.
- 🔄 Avoid deep discharge. Connect the bracelet to charge when the battery level drops to 10-15%. Full discharge (0%) is very harmful to lithium polymer batteries.
- ☀️ Don't leave it in the sun. Overheating (above) +40°C) accelerates battery degradation, the same applies to car storage in summer.
- 🔌 Use quality chargers. Original or certified stabilized voltage adapters (5V/1A) — long-service.
- 📵 Turn off unnecessary functions. A constantly active pulsemeter, notifications and screen highlights drain the battery faster.
Another useful life hack: if you don’t plan to use the bracelet for a long time (for example, during vacation), store it with a charge of 40-60% in a cool place (but not in the refrigerator!), this will slow down the chemical processes inside the battery.
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Optimal operating mode for a long battery life: charge the bracelet at 10-15%, disconnect from charging by 90-95%, avoid extreme temperatures.
Can I charge Mi Band 4 from a power bank or computer?
Yes, the bracelet can be charged from any USB-voltage-producing 5V, And it's not just power bank, laptops, even some car chargers:
Charging from power bank:
- ✅ Pros: convenient on trips, you can charge the bracelet without a socket.
- ❌ Cons: Some power bank models are turned off with low current consumption (like the Mi Band 4), in which case activation of low consumption mode (if there is in the power bank settings) will help).
Charging from a computer or laptop:
- ✅ Pros: always at hand, do not need to look for a socket.
- ❌ Cons: USB-Ports on older PCs may produce insufficient current (less than the current). 0.5A), Which makes the charging very slow.
If you often charge a bracelet from a computer, use it. USB-You can also use the ports on the back of the system unit, which are usually more powerful than the front ports. USB-externally powered hub if standard ports fail.
Car charging is suitable, but only if it produces a stable 5V/1A. Cheap light adapters can have power surges, which is harmful to the battery.
What to do if the bracelet is discharged quickly?
If Xiaomi Mi Band 4 began to discharge in 1-2 days instead of the usual 10-14, the problem can be hidden in the battery and settings.
- Check the active functions: 📊 Permanent pulsemeter (included in Mi Fit) → Device profile → Monitoring of heart rate). 🔔 Frequent notifications (disable unnecessary ones in Mi Fit) → Notifications). 🌙 Screenlighting when lifting your hand (set in Mi Fit) → Display).
Update the firmware
Mi Fit → Device Profile → Update of the firmware
Reset the settings.
Mi Fit → Device Profile → Untie the Device
Check your physical condition.
If the bracelet is discharged even when it is turned off, the power controller or the battery itself is likely to be faulty, in which case only repairs at the service center will help.
⚠️ Warning: Don't try to disassemble the battery replacement bracelet yourself! Xiaomi Mi Band 4 has adhesive body connection, and if you do not slouch, you can damage the display or board.