Modern wearables have become an essential part of life, allowing health and notifications to be tracked, but their autonomy requires regular maintenance.When the Xiaomi Mi Band 4 screen goes out and the vibration discharge notification is ignored, it becomes urgent to connect the device to the power source. Many users face difficulties during initial start-up or after a long downtime when standard methods do not work.
The process of energy replenishment in the trackers of the Mi Band series has its own features that distinguish them from smartphones or full-fledged smart watches. The absence of a classic USB connector and the presence of specific contact sites require a careful approach to connection. In this article, we will discuss in detail all the nuances of the procedure, possible errors and ways to fix them.
First activation and activation after purchase
New fitness bracelets often come with a partially discharged battery to keep it safe during storage. Immediately after being removed from the package, the device may not respond to touch or display the battery icon. This is a normal situation requiring initial recharging before pairing with a smartphone.
To get started, you need to remove the tracker from the silicone strap. The Mi Band 4 is designed so that the capsule with the screen and battery is removed by light pressure into a special notch on the back. Don't use sharp objects so as not to damage the case or screen, you better use your thumb.
Once the capsule is removed, it should be placed in the charger so that the contacts match. The display on the screen should light up within a few seconds. If this does not happen, it may have gone into a deep discharge and it will take time to “rock”.
- 🔋 Remove the tracker from the strap by pressing on the convex part on the back side.
- 🔌 Insert the capsule into the charging unit, observing the polarity of the contacts.
- ⏳ Leave the device on. 10-15 minutes for the indication.
- 📱 Connect the charger to the power adapter 5V/1And.
💡
For the first charge, it is better to use an adapter from an old smartphone with a capacity of up to 1 Amp, since powerful blocks may not start the process due to the low consumption of current by the tracker.
⚠️ Warning: Do not attempt to charge the bracelet without removing it from the strap unless you have a dedicated docking station. Directly connecting the wires to the contacts without fixing can lead to a short circuit.
Technical features of the charger
The design of the charger for Xiaomi Mi Band 4 is simple USB-There are two spring-loaded pins inside the pad, which should fit tightly into the golden pads on the back of the tracker.
One of the common problems is the oxidation of contacts or the penetration of sweat and moisture into the connector. Since the tracker is worn on the wrist, salt deposits can create an insulating film that prevents charging. Regular cleaning of contacts with dry soft cloth or cotton swab lightly moistened with alcohol will help avoid problems.
Same as himself. USB-The charging connector can also be a source of problems if it has loosened or dust has fallen inside. Mechanical damage to the pins causes them to stop springing and not reach the contacts on the body.
| Parameter | Meaning | Note |
|---|---|---|
| Type of connector | USB-A (specific) | Only for the Mi Band |
| Input voltage | 5 volts. | USB standard |
| Current power | ~250 mA | Low consumption |
| Charging time. | ~1.5 hours | Up to 100%. |
Charging process: step-by-step instructions
The basic algorithm is simple, but it requires care. First, connect the charger to the power source — it can be a computer port, power bank or network adapter. The indicator on the charger itself usually does not burn, since the circuit is closed only when it comes into contact with the tracker.
Insert the Mi Band 4 capsule into the lodgement. You should feel a slight click or stop. Make sure the convex part of the screen is pointed upwards and the contacts on the capsule match the charging pins. The screen should light up and display the current charge level or lightning animation.
If the light goes off, leave the device alone. It takes about an hour and a half to fully restore the capacity. It's not typical of this model to overheat during charging, but it's not worth leaving the device in direct sunlight or on a hot surface.
☑️ Verification of the charging process
When you charge, the screen can go out to save energy, which is a standard behavior, and you can periodically check the status by touching the touch button, and when the battery is full, the animation changes, and the device reports 100% charge.
How long does Xiaomi Mi Band 4 charge?
The time it takes to recover power depends on the degree of discharge and battery status. The new 135 mAh battery gains full capacity in about 90 minutes. If the device has been discharged to zero, the first 10-15 minutes can pass without changing the percentage on the screen.
Over time, the capacity of the lithium polymer battery decreases and the operating time decreases, but the charging speed remains approximately the same.However, if you notice that the Mi Band 4 charges suspiciously fast (for example, in 20 minutes) and discharges just as quickly, this is a signal of degradation of the battery.
Using poor-quality cables or weak USB ports can increase charging time. It is important to use serviceable wires that can pass the necessary current without significant voltage losses. Cheap “charging only” cables often have high resistance.
⚠️ Warning: Leaving the device on charge overnight or for a few days puts you at risk of overcharging, although the power controller should prevent this. 3-4 hours after 100%.
Effects of temperature on charging
Problems in charging and methods of their solution
When the light doesn't light up, it's the most common user complaint, and it's often a simple shift in the contacts, and you can try to move the capsule slightly to the right or left, up or down in the charger to find a common point.
If mechanical action doesn't work, check the cleanliness of the contact areas. Sweat, hand cream and dust create a non-conductive layer. Use an eraser to clean the gold contacts on the tracker itself, which often brings back life to "dead" devices. You can also wipe the contacts with an alcohol napkin.
In rare cases, the problem lies in a software failure when the power management system “hangs”, in which case, connecting to the Mi Fit (or Zepp) application after the device still gives signs of life can help, sometimes requiring a factory reset via the bracelet menu.
- 🧹 Wipe the contacts with alcohol or clean with a lastic.
- 🔄 Move the capsule in the charger to find contact.
- 🔌 Try another one. USB-port.
- 📲 Check for firmware updates in the app.
What to do if the bracelet is not charged
If after all the manipulations Xiaomi Mi Band 4 remains black, it is possible that the battery has gone into deep discharge. Leave the device on charge for 30-60 minutes, even if the screen does not respond. Sometimes the battery needs prolonged exposure to low current to get out of sleep mode.
Check the charger itself. Contacts inside the plastic pads may have become oxidized or clogged. Carefully put a thin needle upwards to ensure better pressure on the tracker body. Carefully avoid contacting each other.
In the case where nothing helps and the device does not show signs of life for more than an hour, the battery or power controller probably failed.Replacement of the battery in the Mi Band 4 is possible, but requires skills in soldering microscopic cells and opening the sealed housing, which is often not economically feasible.
💡
If the bracelet does not respond to charging after cleaning the contacts and waiting for a long time, it is likely that there is a problem in the hardware (battery or controller) requiring repair or replacement of the device.
Tips for extending battery life
To ensure that the lithium polymer battery lasts as long as possible, avoid full discharges to zero. Try to put the device on charge when the energy level drops to 15-20%. Deep discharge is harmful to the chemistry of modern batteries.
Also worth paying attention to the screen settings: Constantly running the function “Raising the wrist” or setting maximum brightness significantly reduce battery life, increasing the frequency of charging cycles. Optimizing the settings in the Zepp application will help increase the intervals between rechargings.
If you plan to not use the tracker for a long time, leave it with a charge of about 50-60% and off.Storing a fully discharged or fully charged device for months can lead to irreversible loss of capacity.