Owning a smart fitness bracelet makes it much easier to monitor health and physical activity, but regular recharging of the device is inevitable. Xiaomi Mi Band 4 model features a lithium polymer battery with a capacity of 135 mAh, which provides up to 20 days of battery life, but there comes a point when the screen goes out and the vibration stops responding to notifications. Proper connection to the power source is not just a mechanical action, but a process that requires accuracy, especially given the design of the removable capsule.
Many users have difficulty getting to know the device for the first time without knowing how to remove the tracker from the strap or why the indicator flashes red instead of green. Incorrect connection can lead to oxidation of contacts or even damage to internal electronics. In this article, we will take a detailed look at all the steps of the process, from equipment preparation to troubleshooting common malfunctions, so that your gadget is always ready for work.
Before you start to physically manipulate, it's important to understand the basic principles of the charger that comes with it. USB-The contact pads on the back of the tracker should be perfectly in contact with the response pins on the cable to transmit power without overheating.
Charger design and preparation
The fitness bracelet comes with a special cable, which is the only way to recharge the battery. USB-It is important to note that using third-party charging with the wrong voltage or current can be dangerous, so the original cable is the best choice for the longevity of your device.
Before the procedure, visually examine the contacts. There are two golden dots on the back of the capsule that should not be contaminated, oxides or traces of sweat. If you wore the bracelet during exercise, it is recommended to wipe the back surface with a soft dry cloth to ensure reliable electrical contact.
- 🔌 USB-Standard Type A connector for connecting to any 5B source.
- 🔋 Plastic holder with a notch that repeats the shape of the capsule Mi Band 4.
- ⚡ Two spring-loaded pins for energy and data transfer.
- 💡 LED indicator signaling the status of the process.
⚠️ Warning: Never try to charge the capsule without removing it from the silicone strap.Attempting to push the strap device into the charging socket will cause the silicone to rupture and possible breakage of the plastic case of the holder.
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Use it for charging. USB-a computer port or power supply with a current of no more than 1A. The use of powerful adapters from smartphones with support for fast charging (Quick Charge) is theoretically possible, but can reduce the life of a small battery bracelet.
How to remove the capsule from the strap
The most common mistake of beginners is to pull the tracker out by force. The Mi Band 4 design provides a tight fit to provide IP68 moisture protection, so it requires some effort and proper technique. The capsule is held in the pad by friction and the specific shape of the edges.
To extract, turn the bracelet down, find on the inside of the strap, where the capsule is attached, a distinctive protrusion or indentation, and that's where you press your thumb to push the tracker out, and you have to be confident and upward, from wrist to screen.
☑️ Proper extraction of the tracker
If the capsule does not respond immediately, do not use sharp objects such as scissors or screwdrivers, as you can damage the sealing layer or scratch the plastic. it is better to bend the strap slightly at the mounting site to change the pressure angle, or preheat the silicone in warm hands, making it more elastic.
| Action. | The result | Risk of error |
|---|---|---|
| Pressing the ledge | The capsule comes out smoothly. | Low. |
| Pulling over the edges | Damage to the strap | High-pitched |
| Use of tools | Scratches on the hull | Medium. |
| Heating the strap | Simplification of extraction | Low. |
Process of connecting to the charging cable
Once the capsule is removed, you need to navigate it in space correctly. The charger has a strictly defined geometry: the convex part (convex, with a pulse sensor) must look downward, towards the contacts of the cable, and the concave part (screen) - up. It is difficult to confuse the sides, but it is possible if you act by touch.
Insert the capsule into the plastic holder until the characteristic click or tight fit. You should feel that the device is fixed and does not hang. If the contacts match correctly, the battery icon should light up on the Mi Band 4 screen, and the LED indicator on the cable (if you have one in your version of the accessory) or on the bracelet itself will start flashing.
Status indications play a key role in understanding what's happening to the device. The orange glow usually means that charging is underway, and the green color signals a full charge or successful connection. If the indicator flashes red, it can indicate a critical battery discharge or poor contact.
⚠️ Warning: If the indicator lights up and goes off immediately after you connect, or flashes chaoticly, immediately turn off the device. This may indicate a short circuit due to moisture on the contacts or a malfunction of the battery.
Make sure that USB-The connector is plugged into the port, and a common problem is that the cable doesn't fit in completely, and the contact disappears at the slightest movement.
Indicators and charging time
The full recovery cycle of a 135 mAh battery takes relatively little time. On average, it takes 1 to 2 hours to fully charge a fully discharged Xiaomi Mi Band 4. The time-dependent battery state is nonlinear: the main charge is quickly gained, but the last percentages can take longer to balance the cells.
During the process, the device may heat up slightly in the contact area, which is a normal physical reaction of lithium polymer batteries to the current flow, but if the heat becomes palpable and unpleasant to the fingers, the procedure should be interrupted.
- 🟠 Orange flashing: Active charging (level below 90%).
- 🟢 Green constant: battery charged at 100%.
- 🔴 Red flashing: connection error or deep discharge.
- ⚪ No reaction: problem with cable, port or capsule.
What to do if the bracelet has been discharged for a long time?
It is important not to leave the device charging for days unnecessarily. Although the power controller must cut off current when it reaches 100%, regular recharging negatively affects the battery chemistry, reducing its overall capacity over time.
Problem Solving: Bracelet not charged
When Mi Band 4 refuses to respond to the connection, it's not uncommon. The first and most common cause is contamination of the contacts. The sweat that contains salts, when dried, forms a conductive or insulating plaque that interferes with normal current.
The second reason is the oxidation of the contacts on the charging cable itself, and the pins on the charging cable can get darker over time, clean them carefully with a cotton swab soaked in alcohol, and it's worth checking for yourself. USB-cable for fractures, especially at the connection point with the plastic holder, as this is a zone of high mechanical stress.
If there's no visual defect, try changing the power source. USB-Sometimes the ports on the front panel of the system unit may not provide enough voltage to start charging a deeply discharged device.
⚠️ Warning: If the bracelet is in water, make sure that the contacts are completely dry before charging.
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90% of charging problems are solved by thoroughly cleaning the contacts on the capsule and cable with an alcohol solution or eraser.
Frequent questions and battery maintenance
To extend the life of your wearable, it is important to follow simple rules of operation: Lithium polymer batteries do not like extreme states: full zero and constant hundred. The optimal range for storage and use is from 20% to 80%, although modern controllers minimize the harm from full cycles.
Regularly update your firmware through the Mi Fit (or Zepp) app. Developers often release patches that optimize power consumption and fix errors in the charge controller. The current version of the software can solve software bugs that block the battery display.
Keep the bracelet dry at room temperature. High temperatures (leaving in the sun in the car) and low temperatures (leaving in the sun in the car in the winter outside) accelerate the degradation of the electrolyte inside the battery. If you plan to stay away from the device for a long time, charge it to 50-60% and turn it off.