How to charge the Xiaomi Mi Band 4 bracelet

Owners of the popular fitness tracker often face the need to replenish energy, but not everyone knows the intricacies of this process for the fourth model. Xiaomi Mi Band 4 is equipped with a lithium-polymer battery with a capacity of 135 mAh, which provides up to 20 days of battery life, but over time the battery will have to recharge. Improper handling of the port or the use of poor-quality accessories can significantly reduce the life of the device, so it is important to follow the basic rules of operation.

Unlike smartphones, it uses a specific connector that requires careful handling, which seems trivial but has its own nuances, ignoring which leads to poor contact or damage to charging pins. Let's go through all the steps, time slots and display features in detail so that your gadget lasts as long as possible.

Accommodation and preparation of the workplace

Before starting the procedure, you must make sure that the original charger, which comes with the tracker. USB-a cable with a special connector that is inserted into the recess on the inside of the Mi Band 4 capsule. Using third-party high-current adapters can be unsafe, so it is better to connect the cable to the computer port or standard 5 volt power supply.

It is important to prepare a clean and dry surface, as moisture or dust on the contacts is unacceptable. Contact areas on the tracker itself and on the cable must be absolutely clean, otherwise resistance will grow, and charging will go slowly or intermittently. If you wear the bracelet during training, it often remains sweat, which contains salts that corrode the metal.

⚠️ Warning: Never try to charge the device if moisture is visible on the contacts - this is guaranteed to lead to oxidation and possible short circuit.

Make sure the power source is in good condition. USB-The port of the computer, it has to give out enough current, usually 0.5 Amperes or more. Weak ports in old monitors or keyboards may not start the charging process, and the tracker simply will not react to the connection.

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Periodically wipe the contacts on the capsule with a dry soft cloth or cotton swab soaked in alcohol to remove oxides and contaminants.

Removing the tracker from the strap

The most common mistake of beginners is to try to charge the device without removing it from the silicone strap. Xiaomi Mi Band 4 design does not provide charging in assembled form, since the strap completely blocks access to the bottom end of the capsule.

The extraction process requires some effort, but you need to be careful not to damage the attachments. Take the capsule with both hands: one hold the strap, and the other press on the convex part of the tracker on the back. The movement should be pushable, pointed up and slightly to the side.

• 🖐️ Put your thumb in the center of the bottom of the tracker (where the contacts are located).
• 🔄 Moving "from yourself" squeeze the capsule out of the hole in the strap.
• ⚠️ Do not use sharp objects such as a knife or screwdriver to avoid scratching the case or screen.
• 💪 If the tracker sits very tightly, you can slightly stretch the silicone around the hole with your fingers.

Once removed, inspect the body for cracks or chips. The silicone strap may stretch over time, making the procedure easier in the future, but new models often sit very tight. The main thing is not to overdo it with force, so as not to break the plastic ears of the tracker itself.

Technology of connection to the charger

The Mi Band 4 charging cable has a specific connector shape that must fit exactly into the slots on the case. USB-The connector, and the other one has a convex connector with two metal contacts, and the tracker itself has two feedback contacts in the recess.

The orientation is critical: the convex part of the connector must match the recess on the tracker. If you try to insert the cable incorrectly, it just won't fall into the slots, and magnetic attraction won't occur. Unlike some other models, there are no powerful magnets holding the cable, so the contact is mechanical.

Insert the connector into the bottom of the tracker to the end. You should feel a slight click or a tight fit. Metal pins should be in full contact with the sites on the device. If the contact is incomplete, charging will not begin, or will go intermittently.

Once the entire circuit is connected to the power supply, the tracker screen should light up. If that doesn't happen, try to move the connector in the socket a little bit or wipe the contacts again. Sometimes the oxide film on the contacts prevents the current from passing in the first seconds.

Status indication and charging time

Understanding the signals the device is sending will help you control the process. Once the current goes into the battery, the screen Xiaomi Mi Band 4 will display a large icon of the battery, the color of the indicator and its behavior will tell you about the current status.

If the battery has been completely discharged, only a red or orange indicator may light up at first, and the screen may not turn on immediately.This is normal for lithium batteries that have gone into deep discharge. Pre-charging can take 5 to 10 minutes before the device "revives" and shows the percentage of charge.

• 🔋 Orange indicator – the charging process is underway, the level below 100%.
• 🟢 Green indicator: battery fully charged.
• ⚡ Blinking battery – critically low charge, urgent connection required.
• ❌ Strike-out battery – charging error or poor contact.

The full charging time of the Mi Band 4 is about 1.5-2 hours. It is not recommended to leave the device on charge for the whole night or for several days, although modern power controllers are able to cut off the current when reaching 100%.

Typical problems and methods of their solution

Even if all instructions are followed, users may find that the tracker refuses to charge, most often the problem lies in the oxidation of contacts due to sweat or water.

Another common reason is the use of USB-Some users try to charge the bracelet from ports in the car or weak power banks that can not start the process. It is also worth checking the cable itself: it is thin and with frequent use can break inside the insulation.

⚠️ Note: If after cleaning the contacts and replacing the cable the device still does not charge, it may be a problem in the power controller or the battery itself - service will be required.

If you notice that the bracelet is charging for a very long time or warms up in the process, immediately turn it off. Lithium polymer batteries are sensitive to overheating, and the operation of a faulty device can lead to battery bloating.

Tips for extending battery life

To make Xiaomi Mi Band 4 enjoy battery life as long as possible, it is important to take good care of the battery. Lithium batteries do not like extremes: they are harmful as a full discharge to zero, and the constant being on charge at 100%.

Try to charge when the energy level drops to 15-20%. Deep discharge when the tracker stops turning on is stressful for battery chemistry. If you plan to store the gadget for a long time, leave it on a charge of about 50-60%.

• 🌡️ Avoid extreme temperatures: Do not charge the tracker in the cold or in direct sunlight.
• 💧 Keep away from moisture: although the tracker is moisture-protected, you can not charge a wet device.
• 🔌 Use quality cables: cheap Chinese counterparts may not have the right current filters.
• 📉 Do not discharge to zero regularly: try to put on charging until completely turned off.

These simple rules will keep the battery capacity high even after a year of active use, remember that the battery life is limited by the number of charge-discharge cycles, and careful attitude will help to increase this resource.

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The optimal operating mode is charging with a balance of 20% and decharging at 100%, without overheating and deep discharge.