Xiaomi Mi Band 4 is one of the most popular fitness trackers, combining accessibility, functionality and stylish design. However, even such a simple device can have operational issues, especially when it comes to charging. Mishandling the battery can shorten the life of the bracelet or even make it fail. In this article, we will understand how to properly charge the Mi Band 4, what accessories are needed for this, how long the process takes, and how to avoid typical errors.
Unlike smartphones, fitness bracelets have their own features: a compact battery, a specific charging connector and a limited battery life. If you just bought the Mi Band 4 or experienced problems charging, this guide will help you understand all the nuances, we will also tell you how to extend the life of the battery and what to do if the bracelet does not charge.
Which charger is suitable for Xiaomi Mi Band 4?
The first thing that Mi Band 4 owners have to deal with is finding the right charger, and it comes with a special cable, but what if it gets lost or fails? It's important to understand that the Mi Band 4 uses a proprietary connector, so the standard ones are: USB-Smartphone cables or charging will not work.
The original Mi Band 4 charger has two metal contact pads that are magnetically attracted to the back of the bracelet.If you need to buy a replacement, look for the following options:
- 🔌 Xiaomi’s original cable is the most reliable option, but it’s hard to find in retail stores, usually sold on official sites or in service centers.
- 🔄 Universal chargers for the Mi Band are suitable for models 3, 4, 5. It is important to check compatibility with the Mi Band 4, as the connectors may differ.
- ⚡ Wireless charging stations – some manufacturers offer magnetically mounted docking stations, but they are often more expensive and do not always work consistently.
Avoid cheap Chinese products without certification, which can damage the battery or even cause a short circuit. If you buy a charger outside the official store, check the reviews and ratings of the seller.
Step-by-step: how to charge Xiaomi Mi Band 4
The charging process of the Mi Band 4 is simple, but there are a few nuances that will help you avoid errors.
- Take the capsule off the bracelet, pull it from the strap towards the screen, and don't put too much effort into it, because the mount is fragile.
- Connect the charger to USB-You can use a smartphone adapter (5V/1A or 5V/2A) Or connect directly to the computer.
- Attach the capsule to the charger, and the contacts must match the magnetic pads on the charger, and if the bracelet is not magnetized, check the position correctly.
- Wait until the charge starts. The Mi Band 4 will show a charging indicator (battery icon). If the indicator is not on, try reconnecting the cable or using another one. USB-port.
While charging, the bracelet may heat up — that's normal, but if it gets hot, immediately disconnect it from the power. The optimal charging temperature is room temperature (15-25 ° C).
☑️ Checklist before charging Mi Band 4
How long does the Xiaomi Mi Band 4 charge?
The charging time of the Mi Band 4 depends on several factors: battery discharge level, charger quality and power supply. On average, full charging takes 1.5-2 hours.
| Charge level when connected | Time to 100% | Notes |
|---|---|---|
| 0–10% | 2 hours | It is recommended to charge at this level no more than 1 time in 2-3 months |
| 20–30% | 1 hour 20 minutes | Optimal range for regular charging |
| 50% | 40-50 minutes | Quick recharge if you need to use the bracelet urgently |
| 80–90% | 20-30 minutes | It is not recommended to keep on charging after 100%. |
Important: If the bracelet is discharged to 0% and does not turn on after connecting to charging, wait 5-10 minutes - sometimes it takes time to activate the power controller.
Some users leave the Mi Band 4 on charge overnight, but this can have a negative impact on battery capacity.
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If the bracelet is charging too long (over 3 hours), check the cable and adapter.Maybe the problem is insufficient current (use the adapter at 1–2A).
Frequent charging errors and how to avoid them
Even a simple process like charging the Mi Band 4 can be buggy, and here are some of the most common problems and ways to solve them:
- 🔋 The bracelet is not charging, and the reasons are: contaminated contacts, faulty cable, low voltage in the air. USB-Solution: wipe your contacts with a liquor wipe, try another cable or port.
- 🔥 Overheating while charging. Causes: using a non-original charger, charging in direct sunlight. Solution: Turn off the bracelet and let it cool, use only certified accessories.
- ⚡ Charging is interrupted. Causes: poor contact, unstable power from the USB-Solution: connect the cable directly to the socket through the adapter.
- 📉 Quick discharge after charging. Causes: battery wear, background processes (e.g., constant sync with your phone). Solution: calibrate the battery (discharge to 0% and charge to 100%) or reset the bracelet settings.
⚠️ Warning: If the bracelet is 100% after charging, but turns off after a few minutes, it is a sign of a battery failure.
Another common mistake is to use a wet bracelet. Even if the Mi Band 4 has water protection (IP68), the charging contacts are not sealed. Make sure the capsule is dry before charging, especially if you have recently swam or showered.
How to extend the battery life of Xiaomi Mi Band 4?
The battery in the Mi Band 4 is designed for 300-500 charge cycles, but with proper operation, this period can be extended.
- 🔄 Avoid full discharge. Optimal charge the bracelet at 20 to 30 percent charge. Deep discharge (0%) reduces battery life.
- ☀️ Keep the bracelet in a cool place. High temperatures (above 30)°C) accelerate battery degradation. Do not leave it in the sun or near heating appliances.
- 📵 Turn off unnecessary functions. Constant sync with your phone, notifications and screen lighting consume charge. Configure the bracelet to suit your needs in the Mi Fit app.
- ⚡ Use the original charger. Uncertified cables can deliver unstable voltages that damage the battery.
If you don't plan to use the bracelet for long periods (e.g., while on vacation), charge it up to 50% and turn it off. Storing it with a fully discharged or charged battery makes it worse.
What to do if the bracelet has stopped holding the charge?
Can I charge Xiaomi Mi Band 4 without my native cable?
There are different situations: a cable is lost, it breaks, or you are in a place where you can't buy it, and alternative charging methods can be tried, but they require caution.
One option is to use a universal charger for wearable electronics, which has adjustable contacts that can be adjusted to the Mi Band 4 connector. However, this method is risky: an incorrect connection can damage the power controller. If you decide to do this, follow the instructions:
- Carefully press the contact board to the contacts of the bracelet.
- Connect the board to a power source with a voltage of no more than 5V.
- Watch the temperature of the bracelet - if overheated, immediately turn off the power.
Another way is to use a charger from the Mi Band 3 or 5, if you have one of these devices, and they have similar connectors, but they may differ in the location of the contacts. Check compatibility before connecting.
⚠️ Warning: Trying to charge the bracelet through popular methods (such as soldering wires to contacts) almost always causes the device to fail. If you have no experience in electronics, it is better to wait for the original cable.
What to do if Xiaomi Mi Band 4 is not charging?
If the bracelet is not responding to the charger connection, don't panic. First, check for the obvious reasons:
- 🔌 Cable or adapter. Try another. USB-cable and power supply, sometimes the problem lies in a faulty computer port.
- 🧹 Contact contamination. Clean the contacts on the bracelet and charger with a cotton swab soaked in alcohol.
- 🔄 Software glitch: Reset the bracelet by holding the touch button for 10-15 seconds.
- 📱 Application problems: Update Mi Fit to the latest version or reinstall it.
If the bracelet is still not charging, try resetting it to factory settings:
- Open the Mi Fit app.
- Go to Profile → Mi Smart Band 4 → Additional → Resetting.
- Confirm the action and wait for the reboot.
If the reset didn’t help, there may be a hardware problem, in which case, contact Xiaomi’s service center, with the average cost of diagnosis around 500 rubles, battery replacements of 1,000-1,500 rubles (prices are current for 2026).
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In 90% of cases, the problem with charging is solved by cleaning the contacts or replacing the cable. Hardware malfunctions (for example, failure of the power controller) are less common, but require professional repair.