Owning a modern wearable requires not only the ability to use its functions, but also the proper maintenance of the power source. Fitness tracker Xiaomi Mi Band 4 became a legendary device due to its long battery life, but even the most reliable battery needs regular energy replenishment. Many owners face the first difficulties at the moment when the screen goes out and vibration reports a critical level of charge.
The process of recharging this device has its own unique features that distinguish it from the usual smartphones or smartwatches with magnetic docking stations. In this model, engineers used a custom solution that can initially puzzle beginners. Understanding the principles of the lithium polymer battery will help you avoid common mistakes and significantly extend the life of your gadget.
You'll learn all the nuances of connectivity, optimal timing and ways to diagnose power problems. We'll learn why the indicator may not light up and how to properly extract the capsule for maintenance. A competent approach to this issue ensures that the tracker will work accurately and consistently throughout its life.
Design features and capsule extraction
The main distinguishing feature of the Mi Band 4 is a removable capsule that contains all the electronics and battery. Unlike previous versions, there are no metal contacts on the outside, which provides a high degree of moisture protection. To begin the charging process, you need to physically remove the tracker from the silicone strap.
This procedure requires care, because inept action can damage the strap or the body itself. On one side of the capsule is a small recess designed to hold the finger, and by pressing it and simultaneously pulling the module in the opposite direction, you release the device.
⚠️ Note: Do not use sharp objects such as knives or scissors to remove the capsule, as there is a high risk of damaging the sealed body or cutting silicone.
Once removed, carefully examine the bottom of the device, and that's where, underneath the curved edge, the two golden contacts needed to transmit electric current are hidden, protected from water and dust while the tracker is in the strap, but must be open to charge.
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When removing the capsule, act confidently, but without sharp jerks, so that the silicone tail of the strap does not break at the mounting site.
Use of the original charger
Complete with a fitness bracelet comes a special cable, which is the only correct way to supply energy. This accessory is a short plastic pad with two protrusions and built-in USB-The design is designed to provide reliable contact with the curved bottom of the tracker.
The process of putting the capsule into the charger requires a certain skill, so you need to insert the tracker into the notch so that the convex side of the screen looks up, and the contacts at the bottom fit tightly with the metal pins on the site, and if the installation is done correctly, the device will lock and not stagger.
You can connect the cable to any standard USB port. This can be a connector in a computer, laptop or smartphone adapter. However, consider the power of the current: the use of powerful fast charging units from modern phones is theoretically possible thanks to the power controller, but the classic USB 2.0 port on your computer or the old 1A adapter will be a more gentle option for an aging battery.
☑️ Proper charging installation
It is important to make sure that the contacts are clean. Oxidation or contamination can then interfere with normal current, which may prevent the process from starting.
Status indication and charging time
After connecting to the power supply, the battery icon should light up on the device screen. If the screen remains black, try moving the capsule a little in the charging pad or erasing the contacts. In normal operation, you will see animations of the filling scale.
The time required to fully recover the capacity depends on the current state of the battery. Usually, the full cycle takes about 1.5-2 hours. At a deep discharge, the indicator may not appear immediately, but several minutes after connection.
| Status of the indicator | Meaning | Action. |
|---|---|---|
| Blinking green | Charging is in progress. | Waiting for completion |
| Green is burning. | Battery fully charged. | Shut off the network. |
| Blinks red | Critical charge level | I need you to charge. |
| It's not burning. | No contact or discharged to zero | Check the contacts |
Users often wonder if it is possible to leave the device on charge overnight. Modern power controllers at Xiaomi are able to cut off current when reaching 100%, but long-term recharging is still not recommended by electronics manufacturers.
Typical problems and methods of their solution
Sometimes users are faced with a situation where the tracker refuses to respond to the connection. The most common reason is the oxidation of contacts due to moisture or sweat. moisture left between the case and the charger creates an insulating film or causes corrosion.
If standard cleaning doesn't work, a more radical but effective method can be tried: some owners gently wipe the contacts with a cotton swab dipped in alcohol, then let the device dry completely, and a light tapping of the capsule on a hard surface with contacts down to shake off the oxides also helps.
⚠️ Warning: Never try to charge a wet device. Water trapped in connectors can short circuit and permanently damage the electronic board.
Another problem could be a software failure where the system can't see the connection, and in this case, rebooting helps, because there's no button, you need to put the tracker on charge, wait for the battery icon to appear, and hold the touch area until a menu or vibration appears.
What if the light is red and does not change?
Extension of battery life
The lithium polymer batteries used in the Mi Band 4 are sensitive to operating conditions. To keep the device as long as possible, avoid deep discharge. Try to set the tracker on charge when the energy level drops to 15-20%, without waiting for a full shutdown.
Temperature is also critical: Do not leave your gadget in direct sunlight or near heaters while charging. Overheating accelerates the degradation of the chemical elements inside the battery, leading to a rapid decline in autonomy.
If you plan to stay off the device for a long time, charge it to about 60 percent and turn it off. Storing a fully discharged or fully charged tracker when it's off can have a negative impact on its future performance. Periodically, every couple of months, check the charge level.
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The optimal charge range for long-term storage of lithium batteries is 40-60%, which minimizes chemical degradation processes.
Using features that constantly activate the screen or vibrator also consumes battery life.Tune the brightness of the screen and the frequency of the pulse survey will help balance functionality and running time.