Users of fitness trackers often face a situation where your favorite gadget suddenly discharges at the most inopportune moment. Xiaomi Mi Band 4 was no exception and, despite the impressive autonomy, requires periodic connection to the power source. Unlike the newer models, this tracker does not have a built-in USB-The squirrel that raises questions for newcomers.
The charge recharge process here has its own technical features, ignoring which can lead to damage to the contacts or malfunction of the device. It is important to understand that the tightness of the case plays a key role, and any careless intervention can lead to loss of moisture protection. In this article, we will discuss all the nuances of the procedure.
We will look at the correct sequence of actions, typical errors and ways to resuscitate the tracker if it has stopped responding to the connection.Complying with simple rules of operation will extend the life of the lithium polymer battery and keep the gadget working for many months.
Features of the design and extraction of the tracker
The first and most important step is to properly remove the main module from the silicone strap. Many users make the mistake of trying to pull the tracker over the edges or using sharp objects, which can result in scratches on the body or damage to the touch screen. The Mi Band 4 design involves a tight fit of the capsule into the strap bed to ensure water resistance.
To safely remove, you have to flip the bracelet upwards with the inside of the silicone belt, and you have a cutout or a recess on the back of the silicone belt, just below the tracker, and you have to gently squeeze the main module out with your thumb, holding the strap with your other hand, and if the tracker is sitting too tight, you can bend the strap slightly at the mounting location to make it easier to exit the capsule.
Once removed, carefully examine the end parts of the tracker, and that's where the two golden contacts are, which are necessary for power transmission, and should be free of contamination, oxides, or sweat, as this directly affects the quality of the connection to the charger. Mud on the contacts is one of the common reasons why the bracelet stops charging.
⚠️ Warning: Never use metal objects such as needles or scissors to remove the tracker from the strap.This can damage the silicone or accidentally close the contacts, which will result in a short circuit.
Why is the tracker sitting so tight in the strap?
Preparation of charger and connection
Included with Xiaomi Mi Band 4 comes a special dock charging, which is a short USB-This holder is shaped like the tracker's entire contours, and it has two spring-pins. USB-cable connector to any available port USB computer, laptop or smartphone power adapter.
Make sure the power supply is in good working order and produces a stable voltage. The best option is to use USB 2.0 or 3.0 ports on your computer or a certified power supply with a current of at least 0.5 A. The use of cheap Chinese adapters with unstable output voltage can adversely affect the charge controller inside the gadget.
Place the extracted tracker in a plastic cable holder. The contacts on the cable and on the bracelet should match perfectly. This usually happens automatically due to the shape of the pad, but sometimes easy correction is required. If the connection is installed correctly, the battery icon will appear on the Mi Band 4 screen, and the vibration will confirm the successful start of the process.
- 🔌 Connect. USB-charging cable to a computer port or adapter.
- 📱 Remove the tracker from the silicone strap, squeezing it through a special hole.
- ⚡ Insert the tracker in the charging dock, combining golden contacts.
- ✅ Check the appearance of the charging icon on the device screen.
☑️ Pre-charging check
Process indication and charging time
Once successfully connected, the user sees on the display an animation of the charging battery. The standard time for full energy recovery for Xiaomi Mi Band 4 is approximately 1.5-2 hours, depending on the degree of battery discharge. It is not recommended to keep the device on charge for days after reaching 100%, although modern controllers cut off current, long-term recharge is still undesirable for battery chemistry.
When charging, the screen can light up periodically, showing the current percentage. If the screen goes out, that's OK, the device goes into energy-saving mode. It's important not to disturb the gadget and not to remove it from the docks without having to knock the contact. Vibration when connected and disconnected is the standard system response.
The charging speed can vary depending on the ambient temperature. At temperatures too low or too high, the controller can artificially slow the process for safety. The optimal temperature for charging is room temperature, ranging from +10 to +30 degrees Celsius.
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If the bracelet is charged for too long (more than 3 hours) and does not reach 100%, try cleaning the contacts with an alcohol wipe or replacing them with a handcloth. USB-cable.
Parameter table and compatibility
For a complete understanding of the specifications of the Mi Band 4 charging process, it is worth looking at the specifications of the device. Below are the main parameters that are important to consider when choosing a power source and assessing the state of the battery.
| Parameter | Meaning | Note |
|---|---|---|
| Battery capacity | 135mAh | Lithium polymer battery |
| Full charge time. | ~2 hours | At 250-500 mA. |
| Type of connector | Contacts (Pogo-pin) | We need a special dock. |
| Autonomy | 20 days | In the economy mode |
As you can see from the table, the battery capacity is relatively small, which is what makes the device compact, but even this amount of energy is enough for long-term operation thanks to optimized software and energy efficient devices. OLED-Understanding these numbers helps you plan your charging cycles correctly.
It is worth noting that real-time operation and charging times may differ from the stated ones depending on notification settings, pulse rate and screen brightness. Active use of sleep and sports monitoring functions significantly increases energy consumption.
Typical problems and methods of their solution
The most common problem is that the tracker doesn't react to the charger, the screen stays black, the battery icon doesn't appear, and 90 percent of the time, it's because the contacts are oxidized, and the sweat and moisture that comes under the strap creates an oxide film on the gold pads that prevents the current from passing.
To solve this problem, you need to carefully wipe the contacts on the tracker and on the charging cable with a dry soft cloth or cotton swab slightly soaked in alcohol. After cleaning, you need to let the device completely dry. USB-port that has been shattered or contaminated.
Sometimes the device can go into a deep discharge if it has been lying unused for a long time, in which case it must be left on charge for 15-30 minutes, even if the screen does not light up immediately, and the power controller takes time to “swing” the battery cell to the minimum voltage necessary to turn on the logic of the device.
⚠️ Warning: If after cleaning the contacts and waiting for a long time (more than 1 hour) the bracelet does not show signs of life, the battery or power controller may have failed.
Tips for extending battery life
To make Xiaomi Mi Band 4 last as long as possible, it is important to follow the rules of operation of lithium batteries. Do not allow the device to be completely discharged and stored in this state. Deep discharge is harmful to the battery chemistry and can lead to irreversible reduction in capacity.
Try to charge the bracelet when the energy level drops to 15-20%, this is the optimal range for starting the replenishment cycle, and avoid overheating the device: do not leave the tracker on charging under direct sunlight or near heating devices, as the high temperature destroys the electrolyte inside the battery.
Regular use of features such as constant heart rate monitoring or wrist lifting to turn on the screen reduces battery life by increasing the frequency of charging cycles. If you don't need these features all the time, you can turn them off in the Zepp Life app (formerly Mi Fit) in the device profile settings section.
- 🔋 Do not keep the device completely discharged for a long time.
- 🌡️ Avoid charging at extremely low or high temperatures.
- 🧼 Regularly wipe your contacts with dry cloth after exercise.
- 📉 Turn off unnecessary monitoring functions to save energy.
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Regular but not excessive charging (in the range of 20-80%) and clean contacts are the main factors in the long life of your fitness tracker.