Owning a modern fitness tracker makes it much easier to monitor health, but requires regular maintenance of the device’s power system. Charging the Xiaomi Mi Band 4 is a process that at first glance seems trivial, but has its own technical nuances that affect the durability of the gadget. Unlike smartphones, it uses a specific connector design that requires careful attention every time you connect to the network.
Many users face problems when the tracker stops responding to the cable or charges extremely slowly, often due to oxidation of contacts or improper positioning of the module in the charger. Understanding the principles of operation of the lithium polymer battery installed inside the capsule will help avoid common operating errors.
In this article, we will take a look at all the stages of connection, consider the specifications of the battery and answer questions that arise from owners of the popular model. Proper care of electronics is the guarantee that the device will last you for many years without losing capacity.
Design of charger and connectors
One of the key features of the Xiaomi Mi Band 4 is a removable tracker module. To access the contacts, you need to remove the capsule itself from the silicone strap. This solution allows you to use the same charging cable for different straps, but requires careful removal so as not to damage the plastic ears of the attachment.
At the bottom of the tracker are two golden contacts that are used to transmit energy, and they're recessed in the body, which provides some degree of protection from moisture, but makes them vulnerable to sweat and dirt, and it's the condition of these surfaces that most often causes charging failures.
The charger that comes with the kit is a short cable with USB-And inside the groove are spring-loaded pins that have to be tightly pressed against the contacts on the tracker, and if the pin is weak, the energy replenishment process will not begin.
⚠️ Warning: Never try to charge the tracker without taking it out of the strap.Attempting to push the strap-wearing capsule into the charging dock can cause the plastic mounts to break or the charger itself to deform.
The contacts are made of metal that is corrosive when exposed to aggressive environments for a long time, and regularly wiping the bottom of the device with dry soft cloth after training or swimming will help maintain good electrical contact.
Step-by-step instructions for connecting to the network
The process of connecting the Mi Band 4 to the power supply is simple, but requires a certain sequence of actions to ensure the result. First, you need to release the tracker module from the silicone bracelet, gently bend the edge of the strap and push the capsule with your thumb.
Next, take the charging cable and insert USB-So, you can have a connector in the port of your computer, laptop, or power adapter, and it's important that the current source is in good working order, and then you can take the tracker and put it in the slot of the charger, and you can notice the orientation, the contacts on the tracker and the pins on the charger should be looking at each other.
If you position it properly, you'll feel a slight click or a tight fit. If the device doesn't respond, try moving the capsule slightly into the groove or flipping it over, sometimes it takes a little effort to overcome the resistance of the spring contacts.
☑️ Pre-charging check
After a successful connection, the battery icon will light up on the screen. 10-15 - Check the power source. USB-ports on computers can provide enough current to activate charging, especially if the port is in sleep mode.
Indication and charging time
One of the main features of the Xiaomi Mi Band 4 interface is the lack of a permanent screen that works in Always-On mode. Therefore, the indication of the charging process is only available when you connect or press the touch button. The display display display displays a large battery icon that fills up as energy accumulates.
A full charge cycle takes relatively little time, thanks to a small battery capacity of just 135 mAh. It usually takes 1 to 2 hours to recover a full charge, which is significantly faster than most modern smartphones with capacious batteries.
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If the tracker has been discharged completely (to zero), the screen may not light up immediately. Leave it in the charger for 10-15 minutes before checking the status.
It is important to understand that the rate of replenishment depends on the current at the outlet of the charger. Using powerful adapters from smartphones with support for fast charging (Quick Charge) will not hurt the tracker, since the power controller will take exactly as much power as necessary, but it will not charge faster due to the limitations of the battery itself.
Below is a table with the main technical parameters of the power system of the tracker:
| Parameter | Meaning | Note |
|---|---|---|
| Battery capacity | 135mAh | Lithium polymer battery |
| Full charge time. | ~1.5 hours | Up to 100% indicator |
| Autonomy (standard) | 20 days | With moderate use |
| Autonomy (GPS) | 35 hours | Actively tracking the route |
Typical problems and methods of their solution
Despite the reliability of the design, users may face a situation where the Xiaomi Mi Band 4 does not charge. The most common reason is the oxidation of the contacts. The sweat containing salts, when dried, forms a plaque that prevents the passage of electric current, which is solved by simply cleaning the contacts with an alcohol napkin or a wipe.
The second is a software failure: sometimes the tracker's operating system can freeze and the device stops responding to external stimuli, including charging, in which case it helps to install the tracker on the charger for a long time (about 30 minutes), after which the power controller can force the system to restart.
What to do if your contacts are blackened?
It's also worth checking the integrity of the charging cable itself. USB-If the charging indicator appears when the cable is bent, it disappears, so the wire is damaged and needs to be replaced.
⚠️ Warning: Do not use damaged cables with bare wires to charge, this can short-circuit and fail not only the tracker, but also the tracker. USB-port of your computer or smartphone.
How to extend the battery life
The battery in the Mi Band 4, like any other electronic device, has a limited life cycle charge-discharge. To maximize the life of the gadget, avoid deep discharge. Try to put the tracker on charge when the energy level drops to 15-20%, without waiting for a complete shutdown.
Long-term storage of a battery-depleted device is detrimental to battery chemistry. If you plan to not use the tracker for a long time, charge it to about 60-70% and turn it off. Periodically, every few months, check the charge level and recharge the device if necessary.
Temperature also plays an important role: Do not leave the tracker on charging in direct sunlight or near heating devices. High temperature accelerates the degradation of the electrolyte inside the battery, which leads to a rapid decrease in its capacity.
Using original or certified charging cables is another important aspect: cheap analogues may not provide stable voltage, which puts an extra strain on the device's power controller.
Use of third-party chargers
Owners of Xiaomi Mi Band 4 often wonder about the possibility of using alternative charging methods, such as docking stations or wireless charging. Standard equipment does not support wireless charging (Qi), so simply putting a tracker on a wireless panel will not work - magnets and coils inside are not provided by the design.
However, there are third-party docking stations on the market that are magnetically connected, and they often look more aesthetically pleasing and conveniently located on the desktop, and when choosing such an accessory, it is important to make sure that it is compatible with the 4th version of the bracelet, since the location of contacts in different generations of the Mi Band is different.
Some users are trying to use universal charging with adjustable contacts ("crocodiles"), this method is highly discouraged, as there is a high risk of closing contacts or damaging the device body with mechanical pressure, and it is safer to purchase a special replacement cable, which is inexpensive.
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The optimal solution for daily use is the original cable or a quality certified analogue, providing a tight contact and stable voltage of 5V.