Why charging the Mi Band 4 properly is so important
The Xiaomi Mi Band 4 fitness bracelet remains one of the most popular wearables even years after its release, and its reliability and functionality depend largely on the state of the battery — and this, in turn, is directly related to how you charge the gadget. Incorrect charging can lead to rapid battery wear, malfunctions or even breakage of the connector.
Many users face typical problems: the bracelet does not turn on after recharging, charging takes too long or the device suddenly turns off, most often these situations arise from the use of unoriginal cables, improper connection or ignoring basic rules of operation. In this article, we will examine all the nuances of charging the Mi Band 4 – from choosing a charger to diagnosing faults.
The Mi Band 4 is a 135mAh battery, and the original cable has a unique magnetic-contact design, which means that even the slightest damage to the connector or the use of cheap analogues can lead to permanent damage to the power controller, so it is so important to follow proven guidelines.
Mi Band 4: what comes in the box and what you need to charge
When buying the new Xiaomi Mi Band 4 as standard, you will find:
- 📦 The fitness bracelet itself in a protective film
- 🔌 Original charging cable with magnetic connector (model) XM-05Q)
- 📄 Short instructions in several languages (including Russian)
- 🔄 Band (usually black, but may vary depending on version)
Important: In some regions (e.g. China), the configuration may differ – instead of a full cable, only the magnetic part without a USB connector is used, in which case you will need to buy a USB-Type-A adapter or use a cable from previous models (Mi Band 3), since the connectors are compatible.
If you have purchased a used or no box bracelet, pay attention to the following details:
- 🔍 The original cable must have Xiaomi marking and serial number.
- 🧲 Magnets in the connector should tightly attract the bracelet - a weak fastening indicates a fake.
- 🔌 Contacts (5 pieces) should not be oxidized or bent.
Should you buy non-original cables? Theoretically, yes, but only if they are certified and have positive reviews. Cheap fakes often cause battery overheating or unstable charging. If you decide to save money, choose cables labeled Qi-certified - they at least pass basic safety checks.
Step-by-step: how to charge Xiaomi Mi Band 4
The process of charging the bracelet is simple, but there are a few critical points that many people miss.
- Take the strap off. Take the bracelet capsule out of the strap carefully by pressing the button on the back, so that the magnetic connector fits tightly into the contacts.
- Connect the charging cable. Connect the magnetic part of the cable to the contacts on the back of the bracelet. You should hear a slight click, which means that the connection is established.
- Put it on the power source. USB-cable-connector (5V/1A) or directly to your computer/laptop. Do not use fast charges with higher voltages 5V — This reduces the battery life.
- Wait for the charge to start. The charge indicator (the animation battery icon) will appear on the bracelet screen. If the indicator does not appear, check the connection or try another one. USB-port.
☑️ Pre-charging check
How long to charge the Mi Band 4? The full cycle takes about 1.5-2 hours, but after 30-40 minutes the bracelet will gain enough charge for a day of operation. It is not recommended to leave the device on charging for more than 3 hours - this can lead to a recharge.
How do you know if the bracelet is fully charged? 100% will appear on the screen, and the charging animation will disappear. In addition, the capsule will warm slightly (but it should not be hot!) If after disconnecting from the cable, the percentage of charge immediately drops - this is a sign of battery wear.
Common Mistakes and How to Avoid Them
Even experienced users sometimes make errors when charging the Mi Band 4, which eventually lead to breakdowns.
| Mistake. | Effects of consequences | How to fix it |
|---|---|---|
| Use of non-original cable | Overheating, unstable charging, controller damage | Buy an original cable or certified analogue |
| Charging from a powerful adapter (Quick Charge) | Accelerated battery wear, risk of bloating | Use the adapter 5V/1A or USB-port |
| Charging in the strap (without removing the capsule) | Poor contact, intermittent charging | Always remove the capsule before charging |
| Staying on charging for more than 4 hours | Recharge, reduce battery capacity | Disconnect after reaching 100% |
One of the most insidious problems is contact oxidation. If the bracelet has stopped charging, check the metal pads on the capsule and cable connector. If you have green plaque or dark spots, carefully clean them with a cotton swab dipped in isopropyl alcohol. Don't use abrasive materials (spatch, needles) - they will damage the coating!
💡
If the bracelet does not respond to charging, try to hold it connected to the device. USB-The computer port is 10-15 minutes, and sometimes the power controller only wakes up after prolonged contact.
⚠️ Never charge the Mi Band 4 from a power bank or a car adapter with a higher voltage 5V. This can cause a power surge and cause the power control chip to fail, at best the bracelet will stop turning on, at worst the battery will rise.
How to extend the battery life of Mi Band 4
The battery in the Mi Band 4 is designed for 300-500 full charge cycles, after which its capacity begins to decline markedly, but if used correctly, this life can be increased by 1.5-2 times.
- 🔋 Keep the charge level in the range of 20-80%, constant charging to 100% and discharge to 0% accelerates degradation.
- 🌡️ Avoid overheating.Do not leave the bracelet in the sun or near heat sources while charging.
- ⚡ Use only original or certified cables. Cheap analogues often lack protection against voltage surges.
- 🔄 Once every 2-3 months, perform battery calibration: completely discharge the bracelet, then charge to 100% without interruptions.
Many users don’t know that the Mi Band 4 has a built-in charging optimization feature. If you connect the bracelet to overnight charging, the system automatically limits current after reaching 80%, and up to 100% recharges only before waking up (if you specified sleep time in the settings), this feature is called Adaptive Charging and is turned on by default.
How to check battery status? On the Mi Fit or Zepp mobile app, go to Device Profile → Battery Status. It shows current capacity as a percentage of the original capacity. If it's below 70%, consider replacing the battery (either at the service center or on your own).
What to do if the bracelet is discharged quickly?
What to do if the Mi Band 4 is not charging
If the bracelet doesn't respond to the charger connection, don't panic. 80 percent of the time, the problem is solved without repair.
- Check the cable and the power supply. Connect the cable to another. USB-Try charging the bracelet from the computer, sometimes the adapters fail.
- Clear the contacts. Use a cotton swab dipped in alcohol to clean the contacts on the capsule and cable. Make sure the contacts are free of moisture or dirt.
- Check the magnetic mount. The magnets must be tightly pulling the capsule. If the mount is weak, the cable is faulty.
Perform reset.
- Connect the bracelet to charge and hold the button on the capsule for 10-15 seconds. This can "wake up" the device.
If the bracelet is still not charging, the problem may be:
- 🔋 Battery - bloating or complete wear (replacement required).
- 🔌 Power Controller - damage to the chip (repair required).
- 💻 Firmware - software failure (try to update via Mi Fit).
⚠️ Warning: If the bracelet gets very hot (hot to the touch) after you're connected to charging, immediately turn it off! This is a sign of a short circuit in the battery. Further charging may cause fire.
In rare cases, the problem lies in the firmware. Try to update the bracelet software through the official app:
- Open Mi Fit or Zepp.
- Go to Profile → Mi Band 4 → Update firmware.
- If a new version is available, install it.
Alternative charging methods: when the original cable is not available
There are different situations: the cable is lost, broken, or you are on a hike without access to the original accessory, in which case you can use alternative methods, but with caution.
| Method | Risks. | Recommendations |
|---|---|---|
| Cable from Mi Band 3/5 | Discordance of contacts (rarely) | Check the polarity before connecting |
| Wireless charging (Qi) | Overheating, slow charging | Use only low-current pads |
| Homemade cable (soldering) | Short circuit, bracelet damage | Only for experienced users! |
| Charging from power bank | Power surges | Use high-quality PB with stable 5V output |
The safest option is to use a cable from Mi Band 3 or Mi Band 5, as their connectors are identical. However, note that the Mi Band 5 contacts are mirrored, so the capsule needs to be flipped. If you decide to solder a homemade cable, be sure to observe polarity:
- 🔴 Red wire, plus (+5V).
- ⚫ Black wire is minus (GND).
Any Qi device with a 5V/1A output will be suitable for wireless charging, but the process will be very slow (up to 6-8 hours), and the bracelet can overheat due to inaccurate positioning of the coils, and we recommend using this method only as a last resort.
💡
Never try charging the Mi Band 4 via micro-USB or Type-C adapters without a magnetic connector.