The Xiaomi Mi Band 4 fitness bracelet remains one of the most popular wearables due to its combination of functionality and affordable price. However, even such a reliable gadget has a weak spot: the battery. Incorrect charging can shorten its life or even make the bracelet fail. In this article, we will examine all the nuances of charging the Mi Band 4, from choosing a charger to solving typical problems.
Many users are faced with questions such as whether it is possible to use charging from another model, how long it takes to fully charge, why the bracelet does not charge or discharge quickly. The answers to these and other questions are found below. We will also reveal hidden functions of the Mi Band 4 charging cable, which are not written in the official instructions, and give recommendations for extending the battery life.
If you have just purchased a bracelet or noticed that it has become worse to hold the charge, this article will help you understand the causes and avoid typical errors. Let’s start with the basics: how to properly connect the Mi Band 4 to charge and what accessories are suitable for this.
What is the best charger for the Mi Band 4?
The original Xiaomi Mi Band 4 kit includes a special magnetic connector charging cable, which has two contacts that should fit tightly to the connector on the back of the bracelet, and it is important to understand that using non-original chargers can damage the battery or even break the bracelet.
Technical characteristics of the original charging cable:
- 🔌 Type of connector: magnetic, 2-pin (Mi-Band-specific 4/5)
- 🔋 Input voltage: 5V/1A (standard USB-port)
- 📏 Cable length: ~20 cm (convenient to connect to power bank)
- 🔄 Compatible with: only with Mi Band 4 and Mi Band 5 (Not suitable for the Mi Band 3/6/7)
Can I use charging from other models? In theory, the charging cable from the Mi Band 5 will do, because it has the same connector. However, the cables from the Mi Band 3 or Mi Band 6/7 have a different type of connector and are not compatible. It is also not recommended to use universal magnetic charging - they may not provide stable contact or apply the wrong voltage.
⚠️ Note: If you lose the original cable, buy only certified accessories labeled Xiaomi or Mi. Cheap analogues often cause the battery to overheat.
Next Next post: How to Charge Mi Band 4
The process of charging the bracelet is simple, but there are several nuances that will help to avoid problems.
- Take the bracelet capsule out of the silicone strap carefully, pull it aside, and it will make it easier to access the contacts.
- Connect the charging cable. Match the magnetic connector with the contacts on the back of the capsule. You hear a slight click, which means that the contact is correctly established.
- Put it on the power source. USB-cable-connector (5V/1A) The bracelet will display a charge indicator (battery icon) on the screen).
- Wait until the charge is fully charged. The time depends on the current charge level (usually 1.5-2 hours).
If the charging indicator does not appear, check:
- 🔌 The density of the magnetic connector (sometimes helps a light press)
- 🔋 Possibility of work USB-port or adapter (try another power source)
- 📱 Cleanliness of contacts on the bracelet (wipe them with a dry napkin if necessary)
☑️ Checklist before charging Mi Band 4
After full charging, turn off the cable to avoid overheating. Don't leave the bracelet on overnight charging, which can shorten battery life. The optimal charge level for storage is 40-60%.
How long is the Mi Band 4 charged: the norm and deviations
The full charging time of Xiaomi Mi Band 4 depends on several factors:
- 🔋 Current charge level: 0% to 100% — ~2 hours, from 20% — ~1.5 hours.
- 🔌 Power supply: adapter 5V/1A charge faster than USB-port (2.5W vs 0.5W).
- 🌡️ Ambient temperature: at lower temperatures +10°C or higher +35°C charging time increases.
| Charge level when connected | Charging time (Adapter 5V/1A) | Charging time (USB-port) |
|---|---|---|
| 0–10% | 120-150 minutes | 180–210 minutes |
| 10–30% | 90–120 minutes | 150–180 minutes |
| 30–50% | 60-90 minutes | 120-150 minutes |
| 50–80% | 30-60 minutes | 90–120 minutes |
If the bracelet is charged for more than 3 hours, this may indicate:
- 🔋 Battery wear (typical after 2-3 years of use)
- 🔌 Faulty cable or adapter (try another kit)
- 📱 Software failure (solved by resetting the bracelet settings)
⚠️ Warning: If the bracelet is heated higher +40°C while charging, immediately disconnect it from power. overheating can cause the battery to bloat.
💡
To speed up charging, use a smartphone adapter (5V/2A) instead USB-But don't plug into Quick Charge or Power Delivery charges, because they can run too high voltage.
Typical charging errors and how to avoid them
Many users accidentally shorten the battery life of the Mi Band 4, making these mistakes:
- Use of non-original cables: Cheap analogues often have poor contact or improper voltage, leading to slow charging or overheating, consequence: battery bloating after 6-12 months.
- Charging from a high-current power bank. Some external batteries give out 5V/2.4A, which exceeds the permissible load for the Mi Band 4.
- Connect to USB 3.0 (blue connector) These ports can give high voltage, consequence: the bracelet stops turning on after several charges.
- Charging at extreme temperatures, leaving the bracelet on charge in direct sunlight or in the cold, the consequence: a 20 to 30 percent decrease in battery capacity.
How to avoid these problems:
- 🔌 Use only the original cable or certified Mi Band 4-marked counterparts.
- 🔋 Connect to the exit adapters 5V/1A (For example, from Xiaomi Redmi smartphones).
- 🌡️ Charge at room temperature (+15…+25°C).
- ⏱️ Do not leave the bracelet on charging for more than 3 hours.
What to do if the bracelet stops charging?
How to extend the battery life of Mi Band 4
The Mi Band 4 battery is designed to last 300 to 500 charge cycles, but if you use it properly, you can increase that.
- 🔋 Keep the charge at 20-80%. Constant charging to 100% and discharge to 0% reduces battery life.
- 🔄 Charge in short cycles. It is better to recharge the bracelet every 2-3 days than once a week from 0% to 100%.
- 🌡️ Avoid overheating. Do not leave the bracelet in the sun or near heat sources (e.g. on the dashboard of a car).
- ⚡ Turn off unnecessary functions. Constant use of screen lighting, notifications and sleep monitoring increases battery consumption.
It is also useful to calibrate the battery once every 2-3 months:
- Discharge the bracelet before automatically shutting down.
- Charge to 100% without interruption.
- Disconnect from charging and use until completely discharged.
- Repeat the charging-discharge cycle again.
This procedure helps to reset the power controller errors and restore the accurate display of the charge level, and after calibration, the bracelet can show an increase in operating time by 10-15%.
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The optimal mode for the Mi Band 4 battery is charging at 20-30% and shutting down at 80-90%, which extends battery life by 30-40%.
What to do if the Mi Band 4 is not charging
If the bracelet does not respond to the charging connection, act on this algorithm:
- Check the cable and the adapter. Try charging the bracelet from another power source (like a computer) If the charging indicator shows up, the adapter is the problem.
- Clean the contacts. Use a cotton swab dipped in alcohol to remove oxidation or dirt from the bracelet and cable contacts.
- Reset the bracelet. To do this, connect it to charging and hold the button (touch area under the screen) for 10-15 seconds.
- Update your firmware. Sometimes charging errors are caused by software failures. Update your bracelet through the Mi Fit app.
- Reset the settings. In extreme cases, reset to factory settings via Mi Fit → Device Profile → Reset.
If the bracelet is still not charged, the cause may be:
- 🔋 Battery bloating (visually noticeable by deformation of the body)
- 🔌 Damage to the power controller (requires repair)
- 💧 Moisture intake (even if the bracelet has protection) IP68, contact may oxidize)
⚠️ Warning: If the bracelet body is swollen or has a characteristic smell (like acetone), immediately stop trying to charge.
Can I charge the Mi Band 4 wirelessly?
No, the Xiaomi Mi Band 4 doesn't support wireless charging according to Qi or other protocols, the bracelet doesn't have the receiving coil needed for induction charging, and trying to use wireless chargers will lead to one of two outcomes:
- ❌ Nothing will happen, the bracelet will not charge.
- ⚡ Overheating or damage – if you try to modify the bracelet (such as soldering the coil), this will void the warranty and may cause a short circuit.
The only safe way to charge is through the original magnetic cable.If you need a wireless charging bracelet, consider newer models like the Xiaomi Smart Band 7 Pro or the Huawei Band 7.
However, there is an alternative option for convenience, using a magnetic power bank, and some accessories manufacturers offer external batteries with a built-in magnetic connector for the Mi Band.
- 🔋 Baseus Magnetic Power Bank (Capacity) 3000 MACh, compatible with Mi Band 4/5)
- 🔌 Xiaomi Mi Portable Charger (requires an adapter for magnetic cable)
These devices allow you to charge the bracelet on the go without removing it from the strap, the main thing is to make sure that the power bank power does not exceed 5V/1A.