The Xiaomi Mi Band 4 fitness bracelet remains one of the most popular activity tracking gadgets, despite the release of new models, its main advantages are long autonomy (up to 20 days in standby mode) and ease of use. However, even such a reliable device requires periodic recharging. If you first encounter the process or notice that the bracelet discharges too quickly, this article will help you understand all the nuances.
Unlike smartphones, where charging is intuitive, wearables have their own features: custom connectors, sensitivity to moisture and power requirements. We will detail how to properly charge the Mi Band 4, what mistakes users most often make, and what to do if the bracelet does not respond to the connection to charge, and you will also find answers to questions about the compatibility of chargers, full charging time and how to extend the battery life.
Completement and original charger
In the box with Xiaomi Mi Band 4 is a special charger – magnetic dock connector with a USB-This is not a universal cable, like smartphones, but a unique adapter that attaches to the bracelet using magnets. It is important not to lose it, since original parts from Xiaomi are not sold in all stores.
If you have purchased a used bracelet or lost charge, you can use analogues from third-party manufacturers. However, there are risks: poor-quality connectors can damage the contacts of the bracelet or cause overheating.
- 🔌 Type of connector - must exactly match the original (2 magnetic contacts) + fixer).
- 📏 The cable length is optimally 20-30 cm so as not to pull the bracelet during charging.
- ⚡ Current strength is not more than 1A, otherwise the battery will wear out faster.
The original charger has a marking MDY-08-EM (for the European version) and supports the input voltage 5V/1A. If you use USB-Hub or charger from the phone, make sure it gives no more 5V — Increased voltage can cause bracelet to fail.
Step-by-step: how to connect the bracelet to charging
The charging process of the Mi Band 4 takes no more than 2 hours, but requires care.
- Remove the bracelet capsule from the strap. To do this, pull it towards the screen, overcoming the resistance of the locks. Don't use force - it's easy enough to press the side.
- Examine the contacts on the back of the capsule, they should be clean, free of oxidation or contamination, and if necessary, wipe them with a cotton swab soaked in alcohol.
- Hold the capsule to the magnetic connector of the charger, and the correct position is when the metal contacts of the bracelet match the pins on the dock, and you hear a slight click of the magnets.
- Connect. USB-charging connector to the power source: computer, network adapter (5V/1A) Or power bank. The bracelet will display a charging indicator, a battery icon with animations.
If the indicator does not catch fire, check:
- 🔋 Density of the contacts (try to press the capsule slightly to the dock).
- 🔌 Possibility of work USB-port or adapter (connect another device).
- 📱 Condition of the cable (whether there is damage to the insulation or bending).
☑️ Pre-charging check
Important: if the bracelet does not respond to the connection to charge, do not try to "wake" it with a button - this can reset the settings. First, make sure that all components are in good working order.
How long does the Xiaomi Mi Band 4 charge?
The full charge time depends on several factors: the discharge level, the type of charger and the power source. The table below shows the average values for the original adapter:
| Level of discharge | Charging time (from) USB-port) | Charging time (from the 5V/1A network adapter) |
|---|---|---|
| 0–10% | 1 hour 40 minutes - 2 hours | 1 hour 20 minutes - 1 hour 40 minutes |
| 10–50% | 1 hour - 1 hour 20 minutes | 40 minutes - 1 hour |
| 50–100% | 30-50 minutes | 20-40 minutes |
Note that if the bracelet is discharged to 0% and shows no signs of life, it may take 10-15 minutes before the charge indicator appears on the screen. This is normal - the battery takes time to gain the minimum charge to turn on.
To speed up the process, use a network adapter instead of a network adapter. USB-However, avoid "fast" charges with currents above 1A, which reduces battery life. USB 3.0 (blue ports) – they can give high voltage.
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If the bracelet is charging too long (more than 3 hours), check the temperature of the capsule. Overheating above 40 ° C indicates a malfunction of the battery or charger.
Frequent errors and their elimination
Even experienced users sometimes face problems when charging the Mi Band 4. Let’s consider typical situations and ways to solve them:
⚠️ Warning: If the bracelet does not charge or turn on after falling or contacting water, do not attempt to disassemble it yourself. Flexible plumes or contacts may be damaged inside - in this case, professional repair is required.
Problem 1: The bracelet does not respond to the connection to the charging.
- 🔍 Check the integrity of the contacts on the capsule and dock (possible contamination or oxidation).
- 🔄 Try rebooting the bracelet: hold the touch button pressed for 10 seconds.
- 🔌 Connect the charger to another USB-port.
Problem 2: The charge is jerked or interrupted.
- 📵 Make sure the capsule fits tightly to the connector (magnets must hold tightly).
- 🔋 Check the cable for overburden or damage.
- 📱 Shut it off. USB-Ports of other devices – may lack power.
Problem 3: The bracelet discharges quickly after charging.
- 📊 Check the active features in the Mi Fit app: turn off the constant pulse, notifications from unnecessary apps.
- 🔄 Reset the bracelet to factory settings via Settings → Reset.
- 🔋 If the autonomy has fallen sharply (from 20 to 2-3 days), the battery may be worn out - replacement is required.
What if the bracelet is charged but not turned on?
How to extend the battery life?
The Mi Band 4 battery lasts for 300 to 500 charge cycles, after which it starts to decline. To delay battery replacement as much as possible, follow these recommendations:
1. Avoid total discharge. Optimal charge range is 20% to 80%. Regular discharges to 0% reduce battery life.
2. Don't leave the bracelet on overnight charge. Once you reach 100%, disconnect it from power. Overcharging, especially at high temperatures, accelerates battery degradation.
3. Keep the bracelet in a cool place. The ideal temperature is 10–25°C. Avoid direct sunlight and heat sources (e.g., near the heating battery).
4. Update your firmware. Xiaomi regularly releases power-optimizing updates. Check the relevance of the software in the Mi Fit app.
5. Turn off unnecessary functions. For example, a constant pulse and sleep autodetection consume up to 30 percent of the charge per day.
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Regular battery calibration (full discharge to 0% and charge up to 100% every 2-3 months) helps to reset controller errors and restore an accurate charge level report.
Can I charge Mi Band 4 from power bank or wireless charging?
Many users are wondering if alternative power sources can be used for the bracelet, and consider the popular options:
Power bank: Yes, but with reservations. Any power bank with 5V/1A or 5V/2A output will do. Avoid Quick Charge models, which can give you high voltage, and it is not recommended to charge the power bank bracelet in the cold (below 0 ° C) - this negatively affects the battery.
Wireless charging: No. The Mi Band 4 does not support Qi technology or other wireless charging standards.Attempts to use magnetic connector adapters for wireless charging lead to overheating and damage to the contacts.
Charging from a laptop or PC: Yes, but only if USB-port provides stable 5V. Ports USB 3.0 (usually blue) can be unstable for low-power devices, and avoid charging while your computer is running (such as games or rendering) – this can cause voltage surges.
Solar panels: Theoretically possible, but not practical. Most portable solar panels don't provide a stable 1A current, which will cause charging to snatch or interrupt. In addition, direct sunlight heats the bracelet capsule, which is harmful to the battery.
What to do if the bracelet does not hold the charge?
If the Mi Band 4 discharges in 1-2 days instead of the promised 20, the problem can be in both the software settings and the hardware.
Step 1. Check your power consumption settings.
- 📱 Open the Mi Fit app and go to Profile → Mi Band 4 → Screen settings.
- 🔄 Turn off the lifting of your hand for activation (this saves up to 15% of your charge per day).
- ⏱ Set a minimum screen lighting time (5 seconds).
Step 2. Update the firmware.
- 📲 In Mi Fit go to Profile → Mi Band 4 → Firmware update.
- 🔄 If an update is available, install it. Newer versions often fix power errors.
Step 3. Reset the bracelet to factory settings.
- 🔧 On the bracelet, go to Settings → Reset (or hold the touch button for 10 seconds).
- 📱 In the Mi Fit app, remove the device and add it again.
Step 4: Check the physical condition of the battery.
- 🔋 If the bracelet is swollen or cracks appear on the capsule, the battery requires replacement.
- 🛠 Contact Xiaomi Service Center or Verified Wearable Electronics Repair Masters.
⚠️ Warning: Do not attempt to open the bracelet capsule yourself to replace the battery. Inside, glue joints and flexible plumes are used, which are easily damaged without a special tool, this will lead to loss of water protection (5). ATM).