How to charge Xiaomi Mi Band 4: a step-by-step guide

Modern wearable gadgets have become an integral part of our lives, but even the most reliable of them periodically require connection to a source of energy. Owners of the popular fitness tracker Xiaomi Mi Band 4 often face the question of the correct connection of the device to charging, especially if they purchased the gadget recently or first encountered battery discharge. The charging process is not difficult, but has its own technical features, ignoring which can lead to damage to contacts or incorrect operation of sensors.

The main feature of the tracker’s design is that the tracker itself is removed from the strap to connect to the docking station.This solution allowed the manufacturer to make the device IP68 waterproof, but requires the user to be careful when handling the contact group.

In this detailed guide, we will look at all the steps of connecting the Mi Band 4 to the network, consider possible problems with the indication and give recommendations for extending the battery life. You will learn how to determine that the device has started charging, and what to do if the screen does not light up after installation on the base. Charging the device is possible only with the complete removal of the tracker from the silicone strap, since the belt material blocks access to contacts.

Preparation of the workplace and check of completeness

Before you start the procedure, make sure you have all the necessary components at hand.The standard Xiaomi Mi Band 4 includes the tracker itself, the silin strap, the charging cable and a brief instruction. It is important that the charging cable is original or certified analogue, as using cheap substitutes can lead to unstable charging current.

Look at the contact group on the back of the tracker. There are two golden contacts that should not have oxidation, dirt or sweat marks. If you wore the device during exercise, it is recommended to wipe the back surface with a dry soft cloth before mounting on charging. Contact oxidation is one of the frequent reasons why the device stops charging or does so intermittently.

You'll need a 5 volt power supply to connect. USB-A port of a computer, laptop, or standard smartphone network adapter, but be careful with Quick Charge, Power Delivery adapters, as they may not correctly detect a low-power device.

• 🔌 Original. USB-cable from the delivery kit with two contacts on one side.
• 💻 power supply: USB-port 5V/1A (fast-charging).
• 🧼 Dry soft fabric to clean the tracker contact pad.
• 📱 Make sure that the tracker has an up-to-date firmware version for the indicator to work correctly.

⚠️ Warning: Do not use powerful car chargers or power supplies from powerful laptops without USB-hub, as power surges in the vehicle's onboard network can damage the tracker's power controller.

The process of removing the tracker from the strap

A key step that often causes difficulties for new users is to properly remove the capsule. The Mi Band 4 design involves putting the tracker tightly into the strap pad to ensure moisture protection. Don't be afraid to apply moderate force, but do it correctly so as not to damage the silicone or body.

Turn the strap upside down, and you'll see that the tracker is inserted into special slots, hold the strap securely with one hand, and press the thumb of the other hand against the convex part of the tracker on the back (where the pulse sensor is located), and the movement should be push-out, directed outward from the wrist.

If the tracker sits very tightly, you can sway it slightly from side to side while still pushing. Once one side comes out of the groove, remove the capsule completely. Mechanical damage to the strap when sloppy is a common problem, so avoid using sharp objects such as scissors or knives.

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To facilitate the extraction of the tracker for the first time, you can slightly warm the strap in warm hands - the silicone will become softer, and the capsule will come out lighter.

Technology of connection to the charger

After you remove the capsule from the strap, look at the charging cable. On one side, it has a standard one. USB-The Type-A connector, and the other one is a special area with two convex contacts, and on the back of the tracker itself, two recessions with metal pads are also visible.

Put the tracker in the cable connector. It's important to keep polarity, although it's hard to make a structural mistake: the convex pins of the cable must fit tightly into the recesses on the tracker. You should feel a slight click or a tight fit. If the contacts are connected correctly, the Mi Band 4 screen will light up, and you will see the battery animation.

Place the assembled structure (cable with tracker) on a flat surface or connect USB-the connector to the power supply. Make sure the wire is not pulled to avoid accidental disconnection.The contact group must remain stationary throughout the charging process.

Indication and time of full charge

Understanding the signals that the device is sending will help you control the process, immediately after you connect, the image of the battery will appear on the screen, and if the battery has been completely discharged, the screen may not light up immediately, but after 1-2 minutes of minimum charge accumulation.

Battery capacity Xiaomi Mi Band 4 form 135 mAh. When using standard USB-port 5V/1A full charge takes about 2 When you charge, the battery icon will fill up. 100%, The animation will stop and the battery icon will be completely painted over.

Importantly, the device doesn't have a sophisticated real-time percentage indication system while charging, like smartphones. The main signal is a light-up screen and a stable icon. Once it reaches 100% charge, the power controller will automatically turn off the current, preventing overcharging.

Typical problems and ways to solve them

Despite the simplicity of the design, users sometimes face situations where the tracker does not respond to the connection. Most often the problem lies in the oxidation of contacts. Sweat, moisture and skin fat create a film that prevents the flow of current. Regular cleaning of the back with an alcohol napkin or dry cloth solves this problem in 90% of cases.

Another common reason is the use of USB-If you connect the tracker to a keyboard or an old monitor, you may not have enough power to start the controller. Try switching the cable to the port directly to the PC motherboard or using a network outlet.

If the screen doesn't light up even after cleaning and changing the port, it may have gone deep.In this case, leave it on charge for 15-20 minutes, even if the screen remains black.The battery controller may take time to activate before displaying the information.

⚠️ Warning: If the tracker heats up more than 40 degrees during charging, disconnect it immediately from the mains.This may indicate a battery malfunction or short circuit within the circuit.

Operational rules and extensions

In order for the Mi Band 4 to last you, it is important to follow the rules of operation of lithium polymer batteries. It is not recommended to discharge the device "to zero" regularly. It is optimal to put the tracker on charging when the energy balance is 10-15%. Deep discharge is harmful to battery chemistry and can lead to bloating.

Also, don't keep the device charging for days after reaching 100%. Although the protection system turns off the current, prolonged exposure to the voltage puts extra strain on the board elements.

Store the device in a dry place. If you have used the tracker in the pool or the sea, be sure to rinse it with fresh water and dry thoroughly before charging. Residues of salt water on the contacts when applying current can cause instant corrosion.

Frequently Asked Questions (FAQ)

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Keeping your contacts clean and avoiding deep discharge are two of the main factors that ensure your fitness tracker lives a long time.